diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0d32ed5..99b53eb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,8 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
 set(CMAKE_AUTOUIC ON)
 
+find_package(OpenSSL REQUIRED)
+
 find_package(Qt5 COMPONENTS
     Core
     Gui
@@ -20,6 +22,7 @@ file(GLOB
     "src/MainWidget/*"
     "src/LicenseModel/*"
     "src/EditClientDialog/*"
+    "src/LicenseGenerator/*"
     "deps/deps.qrc"
 )
 
@@ -40,6 +43,8 @@ target_link_libraries(
     Qt5::Gui
     Qt5::Sql
     Qt5::Widgets
+    OpenSSL::Crypto
+    OpenSSL::SSL
 )
 
 find_package(Git QUIET)
diff --git a/deps/Key b/deps/Key
new file mode 100644
index 0000000..0f0c982
Binary files /dev/null and b/deps/Key differ
diff --git a/deps/deps.qrc b/deps/deps.qrc
index 29a02b0..8cdac45 100644
--- a/deps/deps.qrc
+++ b/deps/deps.qrc
@@ -8,6 +8,8 @@
          <file alias="delete.png">delete.png</file>
          <file alias="info.png">info.png</file>
          <file alias="dropFiles.png">dropFiles.png</file>
+         <file alias="getLicenseFile.png">getLicenseFile.png</file>
          <file alias="tables.ddl">tables.ddl</file>
+         <file alias="Key">Key</file>
     </qresource>
 </RCC>
\ No newline at end of file
diff --git a/deps/getLicenseFile.png b/deps/getLicenseFile.png
new file mode 100644
index 0000000..b87c0e2
Binary files /dev/null and b/deps/getLicenseFile.png differ
diff --git a/deps/tables.ddl b/deps/tables.ddl
index e89bed5..3ee0c0d 100644
--- a/deps/tables.ddl
+++ b/deps/tables.ddl
@@ -8,5 +8,6 @@ CREATE TABLE IF NOT EXISTS clients (
     patronymic TEXT NOT NULL,
     phone TEXT NOT NULL,
     yourCompany TEXT NOT NULL,
+    licenseTime TEXT,
     comment TEXT
 );
diff --git a/src/EditClientDialog/EditClientDialog.cpp b/src/EditClientDialog/EditClientDialog.cpp
index 0085e00..6971915 100644
--- a/src/EditClientDialog/EditClientDialog.cpp
+++ b/src/EditClientDialog/EditClientDialog.cpp
@@ -1,6 +1,8 @@
 #include "EditClientDialog.h"
 
 // Qt
+#include <QCalendarWidget>
+#include <QCheckBox>
 #include <QLabel>
 #include <QLineEdit>
 #include <QPushButton>
@@ -97,7 +99,28 @@ EditClientDialog::EditClientDialog(LicenseModel* model, QWidget *parent)
             m_commentTextEdit->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
             gridLayout->setRowStretch(11, 1);
 
-            m_tabWidget->addTab(m_manualWidget, tr("Manual"));
+            m_tabWidget->addTab(m_manualWidget, tr("Main info"));
+        }
+
+        {
+            auto layout = new QVBoxLayout();
+            auto licenseTimeWidget = new QWidget(this);
+            licenseTimeWidget->setLayout(layout);
+
+            m_useTemporaryLicenseCheckBox = new QCheckBox(tr("License is temporally"), licenseTimeWidget);
+            layout->addWidget(m_useTemporaryLicenseCheckBox);
+
+            m_calendarWidget = new QCalendarWidget(licenseTimeWidget);
+            layout->addWidget(m_calendarWidget);
+            m_calendarWidget->setEnabled(false);
+            m_calendarWidget->setGridVisible(true);
+            m_calendarWidget->showToday();
+
+            connect(m_useTemporaryLicenseCheckBox, &QCheckBox::stateChanged, [&](int state) {
+                m_calendarWidget->setEnabled(state == Qt::Checked);
+            });
+
+            m_tabWidget->addTab(licenseTimeWidget, tr("License time"));
         }
 
         auto hLayout = new QHBoxLayout;
@@ -160,8 +183,6 @@ void EditClientDialog::onFilesChanged(const QStringList &paths)
         m_cityLineEdit->setText(configBody.value("city").toString());
     if (configBody.contains("yourCompany"))
         m_yourCompanyNameTextEdit->setText(configBody.value("yourCompany").toString());
-    if (configBody.contains("createdAtUtc"))
-        m_createdAtUtc = configBody.value("createdAtUtc").toString();
     if (configBody.contains("hardwareHash"))
         m_hardwareHashLineEdit->setText(configBody.value("hardwareHash").toString());
 
@@ -178,6 +199,19 @@ QLabel* EditClientDialog::makeLabel(const QString &text)
 void EditClientDialog::setType(Type type)
 {
     m_type = type;
+
+    m_hardwareHashLineEdit->setEnabled(m_type == Type::Add);
+    switch (m_type)
+    {
+    case Type::Add:
+        m_tabWidget->setCurrentIndex(0);
+        break;
+    case Type::Edit:
+        m_tabWidget->setCurrentIndex(1);
+        break;
+    default:
+        break;
+    }
 }
 
 EditClientDialog::Type EditClientDialog::getType() const
@@ -196,7 +230,8 @@ LicenseModel::LicenseItem EditClientDialog::getLicenseItem() const
     item.city = m_cityLineEdit->text().trimmed();
     item.yourCompany = m_yourCompanyNameTextEdit->text().trimmed();
     item.hardwareHash = m_hardwareHashLineEdit->text().trimmed();
-    item.createdAtUtc = m_createdAtUtc;
+    if (m_useTemporaryLicenseCheckBox->isChecked())
+        item.licenseTime = m_calendarWidget->selectedDate().toString();
     item.comment = m_commentTextEdit->toPlainText().trimmed();
     return item;
 }
@@ -212,6 +247,8 @@ void EditClientDialog::clear()
     m_yourCompanyNameTextEdit->clear();
     m_hardwareHashLineEdit->clear();
     m_commentTextEdit->clear();
+    m_useTemporaryLicenseCheckBox->setChecked(false);
+    m_calendarWidget->showToday();
     m_configPathLabel->setText(tr("Drop file here"));
 }
 
@@ -229,6 +266,16 @@ void EditClientDialog::setClientInfo(int index)
     m_cityLineEdit->setText(item.city);
     m_yourCompanyNameTextEdit->setText(item.yourCompany);
     m_hardwareHashLineEdit->setText(item.hardwareHash);
+    if (item.licenseTime.isEmpty())
+    {
+        m_useTemporaryLicenseCheckBox->setChecked(false);
+        m_calendarWidget->showToday();
+    }
+    else
+    {
+        m_useTemporaryLicenseCheckBox->setChecked(true);
+        m_calendarWidget->setSelectedDate(QDate::fromString(item.licenseTime));
+    }
 
     m_configPathLabel->setText(tr("Drop file here"));
 }
diff --git a/src/EditClientDialog/EditClientDialog.h b/src/EditClientDialog/EditClientDialog.h
index 650b0e8..3586f56 100644
--- a/src/EditClientDialog/EditClientDialog.h
+++ b/src/EditClientDialog/EditClientDialog.h
@@ -2,12 +2,15 @@
 #define LICENSEMANAGER_EDITCLIENTDIALOG_H
 
 // Qt
+#include <QDate>
 #include <QDebug>
 #include <QDialog>
 #include <QDragEnterEvent>
 #include <QLabel>
 
 #include "LicenseModel/LicenseModel.h"
+class QCalendarWidget;
+class QCheckBox;
 class QLineEdit;
 class QTabWidget;
 class QTextEdit;
@@ -55,9 +58,10 @@ private:
     QLineEdit* m_sellerNameTextEdit{nullptr};         //!< Поле ввода названия продавца (если используется).
     QLineEdit* m_cityLineEdit{nullptr};               //!< Поле ввода города.
     QLineEdit* m_hardwareHashLineEdit{nullptr};       //!< Поле для отображения хеша оборудования.
+    QCheckBox* m_useTemporaryLicenseCheckBox{nullptr};//!<
+    QCalendarWidget* m_calendarWidget{nullptr};       //!<
     QTextEdit* m_commentTextEdit{nullptr};            //!<
     QPushButton* m_saveButton{nullptr};               //!<
-    QString m_createdAtUtc;
     QString m_filesPath;
     Type m_type = Type::None;
 };
diff --git a/src/LicenseGenerator/LicenseGenerator.cpp b/src/LicenseGenerator/LicenseGenerator.cpp
new file mode 100644
index 0000000..1751991
--- /dev/null
+++ b/src/LicenseGenerator/LicenseGenerator.cpp
@@ -0,0 +1,53 @@
+#include "LicenseGenerator.h"
+
+#include "crypt.h"
+#include "Util.h"
+
+LicenseGenerator::Result LicenseGenerator::createEncryptedFile(const QString& outputFile,
+                                                               const QString& sshTarget,
+                                                               const QString& password,
+                                                               const RunSshFn& runSsh)
+{
+    Result result;
+
+    QByteArray text;
+    if (!runSsh("ssh",
+                QStringList() << sshTarget << "sed -rn 's/Serial\\t\\t: (.+)/\\1/p' /proc/cpuinfo",
+                password,
+                "get cpu id",
+                &text))
+    {
+        result.error = Error::SshFailed;
+        return result;
+    }
+
+    result.cpuId = text;
+
+    if (text.isEmpty())
+    {
+        result.error = Error::CpuIdEmpty;
+        return result;
+    }
+
+    if ((text.length() != 16 && text.length() != 20) || findFirstNotOf(text, "0123456789abcdef") >= 0)
+    {
+        result.error = Error::CpuIdInvalid;
+        return result;
+    }
+
+    QByteArray encrypted = Crypt::rsaEncrypt(text, fileReadAll(":/deps/Key"));
+    if (encrypted.isEmpty())
+    {
+        result.error = Error::EncryptFailed;
+        return result;
+    }
+
+    if (!fileWriteAll(outputFile, encrypted))
+    {
+        result.error = Error::WriteFailed;
+        return result;
+    }
+
+    result.error = Error::Ok;
+    return result;
+}
diff --git a/src/LicenseGenerator/LicenseGenerator.h b/src/LicenseGenerator/LicenseGenerator.h
new file mode 100644
index 0000000..8d5e52b
--- /dev/null
+++ b/src/LicenseGenerator/LicenseGenerator.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <functional>
+#include <QByteArray>
+#include <QString>
+#include <QStringList>
+
+class LicenseGenerator
+{
+public:
+    enum class Error {
+        Ok,
+        SshFailed,
+        CpuIdEmpty,
+        CpuIdInvalid,
+        EncryptFailed,
+        WriteFailed
+    };
+
+    struct Result {
+        Error error = Error::Ok;
+        QByteArray cpuId;
+    };
+
+    using RunSshFn = std::function<bool(const QByteArray&, const QStringList&, const QString&, const QString&, QByteArray*)>;
+
+    static Result createEncryptedFile(const QString& outputFile,
+                                      const QString& sshTarget,
+                                      const QString& password,
+                                      const RunSshFn& runSsh);
+};
diff --git a/src/LicenseGenerator/Util.cpp b/src/LicenseGenerator/Util.cpp
new file mode 100644
index 0000000..dff9bf8
--- /dev/null
+++ b/src/LicenseGenerator/Util.cpp
@@ -0,0 +1,410 @@
+#include "Util.h"
+
+#include <random>
+#include <optional>
+#include <QRegularExpression>
+#include <QElapsedTimer>
+#include <QCryptographicHash>
+#include <QCoreApplication>
+#include <QCborMap>
+#include <QCborArray>
+
+QByteArray fileReadAll(const QString& path)
+{
+    QFile f(path);
+    QByteArray buf;
+    if (f.open(QIODevice::ReadOnly))
+        buf = f.readAll();
+    return buf;
+}
+
+bool fileWriteAll(const QString& path, const QByteArray& data, int bufOffset)
+{
+    QFile f(path);
+    if (!f.exists()) {
+        QFileInfo fi(f);
+        QDir d;
+        d.mkpath(fi.dir().path());
+    }
+    if (!f.open(QIODevice::WriteOnly | QIODevice::Truncate))
+        return false;
+    int size = data.size() - bufOffset;
+    int bytesWritten = f.write(data.constData() + bufOffset, size);
+    f.close();
+    return bytesWritten == size;
+}
+
+bool splitAddr(const QString& addrOrNetwork, bool isAddress, uint& addr, uint* mask)
+{
+    QString s = "^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})";
+    if (mask)
+        s += "/(\\d\\d?)";
+    s += '$';
+    QRegularExpression re(s, QRegularExpression::CaseInsensitiveOption);
+    QRegularExpressionMatch m = re.match(addrOrNetwork);
+    if (!m.hasMatch()) return false;
+
+    uint a = m.captured(1).toUInt();
+    if (a == 0 || a > 255) return false;
+    uint b = m.captured(2).toUInt();
+    if (b > 255) return false;
+    uint c = m.captured(3).toUInt();
+    if (c > 255) return false;
+    uint d = m.captured(4).toUInt();
+    if ((isAddress && d == 0) || d >= 255) return false;
+    if (mask)
+    {
+        *mask = m.captured(5).toInt();
+        if (*mask == 0 || *mask > 30) return false;
+    }
+    addr = (a << 24) | (b << 16) | (c << 8) | d;
+    return true;
+}
+
+bool ipOk(const QString& addr, bool netmask)
+{
+    uint a;
+    if (netmask)
+    {
+        uint m;
+        return splitAddr(addr, true, a, &m);
+    }
+    return splitAddr(addr, true, a);
+}
+
+QString makeHash(const QString& password)
+{
+    std::random_device rd;
+    QString result;
+    while(result.length() < 16) // salt
+    {
+        uint a = rd() % 52;
+        result += QChar(a < 26 ? ('a' + a) : ('A' + a - 26));
+    }
+    QCryptographicHash hash(QCryptographicHash::Sha1);
+    hash.addData(result.toLatin1());
+    hash.addData(password.toUtf8());
+    (result += '$') += hash.result().toHex();
+    return result;
+}
+
+bool testPassword(const QByteArray& password, const QByteArray& passwordHash)
+{
+    int j = passwordHash.indexOf('$');
+    if (j < 0) return false;
+    QCryptographicHash hash(QCryptographicHash::Sha1);
+    hash.addData(passwordHash.mid(0, j));
+    hash.addData(password);
+    const QByteArray h = hash.result();
+    return std::equal(h.constData(), h.constData() + h.size(), passwordHash.constData() + j + 1);
+}
+
+int findFirstNotOf(const QString& s, const char* chars, int pos, int n)
+{
+    if (n >= 0) n += pos;
+    else n = s.length();
+
+    for(; pos < n; ++pos)
+        for(const char* p = chars;; p++)
+        {
+            if (!*p) return pos;
+            if (s[pos] == char16_t(*p)) break;
+        }
+    return -1;
+}
+
+int findFirstNotOf(const QString& s, QChar c, int pos, int n)
+{
+    if (n >= 0) n += pos;
+    else n = s.length();
+
+    for(; pos < n; ++pos)
+    {
+        if (s[pos] != c)
+            return pos;
+    }
+    return -1;
+}
+
+QByteArray& trimLeft(QByteArray& s, char c)
+{
+    int i = 0, length = s.length();
+    for(; i < length; ++i)
+        if (s.at(i) != c)
+            break;
+    s.remove(0, i);
+    return s;
+}
+
+QByteArray& trimRight(QByteArray& s, char c)
+{
+    if (!s.isEmpty())
+    {
+        int i = s.length() - 1;
+        for(; i >= 0; --i)
+            if (s.at(i) != c)
+                break;
+        i++;
+        s.resize(i);
+    }
+    return s;
+}
+
+QByteArray& trimLeft(QByteArray& s, const char* chars) // ascii only
+{
+    int i = 0, length = s.length();
+    for(; i < length; ++i)
+    {
+        QChar c = s.at(i);
+        for(const char* p = chars;; p++)
+        {
+            if (!*p) goto breakfor;
+            if (char16_t(*p) == c) break;
+        }
+    }
+breakfor:
+    s.remove(0, i);
+    return s;
+}
+
+QByteArray& trimRight(QByteArray& s, const char* chars) // ascii only
+{
+    if (!s.isEmpty())
+    {
+        int i = s.length() - 1;
+        for(; i >= 0; --i)
+        {
+            QChar c = s.at(i);
+            for(const char* p = chars;; p++)
+            {
+                if (!*p) goto breakfor;
+                if (char16_t(*p) == c) break;
+            }
+        }
+    breakfor:
+        i++;
+        s.resize(i);
+    }
+    return s;
+}
+
+QString& trimLeft(QString& s, QChar c)
+{
+    int i = 0, length = s.length();
+    for(; i < length; ++i)
+        if (s.at(i) != c)
+            break;
+    s.remove(0, i);
+    return s;
+}
+
+QString& trimRight(QString& s, QChar c)
+{
+    if (!s.isEmpty())
+    {
+        int i = s.length() - 1;
+        for(; i >= 0; --i)
+            if (s.at(i) != c)
+                break;
+        i++;
+        s.resize(i);
+    }
+    return s;
+}
+
+QString& append(QString& s, const QVector<int>& v, QChar sep)
+{
+    if (!v.isEmpty())
+    {
+        for(int i = 0; i < v.size(); ++i)
+            (s += QString::number(v[i])) += sep;
+        s.resize(s.size() - 1);
+    }
+    return s;
+}
+
+QVector<int> splitToInts(const QString& s, QChar sep)
+{
+    QVector<int> r;
+    if (!s.isEmpty())
+        for(const QString& ss : s.split(sep))
+            r << ss.toInt();
+    return r;
+}
+
+QString getPath(const QString& path)
+{
+    int i = path.length();
+    if (i == 0 || i == 1) return {};
+    --i;
+    if (path[i] == '/') --i;
+    i = path.lastIndexOf('/', i);
+    if (i == 0) return QString(1, '/');
+    if (i < 0) return QString();
+    return path.mid(0, i);
+}
+
+QString getFileName(const QString& path)
+{
+    if (path.isEmpty()) return {};
+    int i = path.lastIndexOf('/');
+    return i >= 0 ? path.mid(i + 1) : path;
+}
+
+
+QJsonArray convertVectorToJsonArray(const QVector<bool> &vector)
+{
+    QJsonArray resultArray;
+    for (const bool & value: vector){
+        resultArray.append(value);
+    }
+    return resultArray;
+}
+
+QVector<bool> convertJsonArrayToVector(const QJsonArray &array)
+{
+    QVector<bool> vector;
+    for (int i = 0; i < array.count(); i++){
+        vector.append(array[i].toBool());
+    }
+    return vector;
+}
+
+
+QByteArray addSizeToByteArray(const QByteArray &arr)
+{
+    QByteArray byteArray;
+    QDataStream stream(&byteArray, QIODevice::WriteOnly);
+    stream << arr.size();
+    return byteArray + arr;
+}
+
+int getSizeJsonInByteArr(const QByteArray &arr)
+{
+    int size = -1;
+    if (arr.size() > 4) {
+        QDataStream ds(arr.mid(0, sizeof(int)));
+        ds >> size;
+    }
+    return size;
+}
+
+QString &append(QString &s, const QVector<QByteArray> &v, QChar sep)
+{
+    if (!v.isEmpty())
+    {
+        for(int i = 0; i < v.size(); ++i)
+            (s += QString(v[i])) += sep;
+        s.resize(s.size() - 1);
+    }
+    return s;
+}
+
+QByteArray toCbor(const QJsonObject &jsonObject)
+{
+    QCborValue cborValue = QCborValue::fromJsonValue(QJsonValue(jsonObject));
+    return cborValue.toCbor();
+}
+
+QByteArray toCbor(const QJsonArray &jsonArray)
+{
+    QCborValue cborValue = QCborValue::fromJsonValue(QJsonValue(jsonArray));
+    return cborValue.toCbor();
+}
+
+QByteArray toCbor(const QJsonDocument &doc)
+{
+    if (doc.isObject()) {
+        return toCbor(doc.object());
+    } else if (doc.isArray()) {
+        return toCbor(doc.array());
+    }
+    return {};  // Return an empty QByteArray if the document is invalid
+}
+
+QJsonDocument fromCbor(const QByteArray &cborData)
+{
+    QCborValue cborValue = QCborValue::fromCbor(cborData);
+
+    if (cborValue.isMap()) {
+        return QJsonDocument(cborValue.toMap().toJsonObject());
+    } else if (cborValue.isArray()) {
+        return QJsonDocument(cborValue.toArray().toJsonArray());
+    }
+
+    // Return an empty QJsonDocument if the type is unsupported
+    return {};
+}
+
+
+QVector<int> arrayFromMask(uint8_t mask)
+{
+    int idx=0;
+    QVector<int> ret;
+    while (mask) {
+        if(mask & 1) ret.append(idx);
+        mask>>=1;
+        idx++;
+    }
+    return ret;
+}
+
+
+QVector<int> intersectUnique(const QVector<int> &a, const QVector<int> &b) {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+    QSet<int> sa(a.cbegin(), a.cend());
+    QSet<int> sb(b.cbegin(), b.cend());
+#else
+    QSet<int> sa = QSet<int>::fromList(a.toList());
+    QSet<int> sb = QSet<int>::fromList(b.toList());
+#endif
+
+    // In-place intersection; 'sa' becomes the result
+    sa.intersect(sb);
+
+    QVector<int> out;
+    out.reserve(sa.size());
+    for (int v : qAsConst(sa)) out.append(v);
+
+    // Optional: deterministic order
+    std::sort(out.begin(), out.end());
+    return out;
+}
+
+int popCount(const QVector<bool> &vec, bool value)
+{
+    int count = 0;
+    for (bool v : vec) {
+        if (v == value)
+            ++count;
+    }
+    return count;
+}
+
+QVector<bool> vectorOr(const QVector<bool> &v1, const QVector<bool> &v2)
+{
+    Q_ASSERT(v1.size() == v2.size());   // sanity check
+    QVector<bool> v3(v1.size());
+    std::transform(v1.cbegin(), v1.cend(), v2.cbegin(), v3.begin(),
+                   [](bool x, bool y){ return x || y; });
+    return v3;
+}
+
+QVector<bool> invert(const QVector<bool> &v)
+{
+    QVector<bool> result(v.size());
+    std::transform(v.cbegin(), v.cend(), result.begin(),
+                   [](bool b){ return !b; });
+    return result;
+}
+
+QString toString(const QVector<bool> &vec, bool value)
+{
+    QStringList out;
+    for (int i = 0; i < vec.size(); ++i) {
+        if (vec[i] == value) {
+            out << QString::number(i + 1);  // 1-based index
+        }
+    }
+    return out.join(", ");
+}
diff --git a/src/LicenseGenerator/Util.h b/src/LicenseGenerator/Util.h
new file mode 100644
index 0000000..07d473d
--- /dev/null
+++ b/src/LicenseGenerator/Util.h
@@ -0,0 +1,304 @@
+#pragma once
+#include <QFile>
+#include <QDateTime>
+#include <QtNetwork/QTcpSocket>
+#include <vector>
+#include <QDir>
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QJsonObject>
+#include <QJsonValue>
+#include <QDataStream>
+#include <deque>
+#include <optional>
+
+template <typename T>
+class FifoContainer {
+
+public:
+    explicit FifoContainer(std::size_t maxSize) : m_maxSize(maxSize) {}
+    void add(T value)
+    {
+        if (m_container.size() >= m_maxSize)
+            m_container.pop_front();  // Remove the oldest element (FIFO)
+        m_container.push_back(value);  // Add the new element
+    }
+    std::optional<double> getAverage() const
+    {
+        if (m_container.size() < m_maxSize) {
+            return std::nullopt;  // Indicate that the container is not yet full
+        }
+        // Use std::accumulate to calculate the sum of the elements
+        T sum = std::accumulate(m_container.begin(), m_container.end(), T(0));
+        return static_cast<double>(sum) / m_container.size();
+    }
+    void clear() { m_container.clear(); }
+    std::deque<T> &container() { return m_container; }
+    operator QString() const {
+        QStringList l;
+        for (int i = 0; i < m_container.size(); ++i) {
+            l << QString::number(m_container[i]);
+        }
+        return l.join(", ");
+    }
+
+private:
+    std::size_t m_maxSize;       // Maximum size of the m_container
+    std::deque<T> m_container;    // FIFO container
+};
+
+QByteArray fileReadAll(const QString& path);
+inline QStringList fileReadAllLines(const QString& path)
+{
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+    return QString(fileReadAll(path)).split('\n', Qt::SkipEmptyParts);
+#else
+    return QString(fileReadAll(path)).split('\n', QString::SkipEmptyParts);
+#endif
+}
+
+bool fileWriteAll(const QString& path, const QByteArray& data, int bufOffset = 0);
+inline bool fileWriteAllLines(const QString& path, const QStringList& list) { return fileWriteAll(path, list.join('\n').toUtf8()); }
+
+template <typename T, typename Cleanup = QScopedPointerDeleter<T>>
+class Ptr : public QScopedPointer<T, Cleanup>
+{
+    typedef QScopedPointer<T, Cleanup> base;
+public:
+    using base::base;
+    operator T*() const { return base::data(); }
+    operator bool() const { return base::data() != 0; }
+#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
+    T* get() const { return base::data(); }
+#endif
+};
+
+//inline bool isConnectingOrConnected(const QTcpSocket* s)
+//{ return s->state() == QAbstractSocket::ConnectingState || s->state() == QAbstractSocket::ConnectedState; }
+inline bool isConnected(const QTcpSocket* s) { return s->state() == QAbstractSocket::ConnectedState; }
+
+QString getPath(const QString& path);
+QString getFileName(const QString& path);
+
+QString toStr(const QHostAddress& a);
+bool splitAddr(const QString& addrOrNetwork, bool isAddress, uint& addr, uint* mask = 0);
+bool ipOk(const QString& addr, bool netmask);
+
+template<class T>
+class Vector : public std::vector<T>
+{
+    typedef std::vector<T> base;
+public:
+    using base::base;
+    int size() const { return base::size(); }
+    void clear() { base::clear(); base::shrink_to_fit(); }
+
+    void remove(int pos) { /*checkIndex(pos);*/ base::erase(base::begin() + pos); }
+};
+
+template<class T>
+class List : public std::list<T>
+{
+    typedef std::list<T> base;
+public:
+    using base::base;
+    int size() const { return base::size(); }
+
+    List& operator+=(const T& v) { base::push_back(v); return *this; }
+    List& operator+=(const List& v) { base::insert(base::end(), v.begin(), v.end()); return *this; }
+    List& operator<<(const T& v) { return *this += v; }
+    List& operator<<(const List& v) { return *this += v; }
+};
+
+namespace Alg
+{
+template<class C> inline void remove(C& c, const typename C::value_type& value)
+{
+    typename C::iterator i = std::remove(c.begin(), c.end(), value);
+    c.erase(i, c.end());
+}
+template<class C, class P> inline void removeIf(C& c, P pred)
+{
+    typename C::iterator i = std::remove_if(c.begin(), c.end(), pred);
+    c.erase(i, c.end());
+}
+
+template<class I, class T> inline bool contains(I first, I last, const T& value)
+{
+    I i = std::find(first, last, value);
+    return i != last;
+}
+template<class I, class P> inline bool containsIf(I first, I last, P pred)
+{
+    I i = std::find_if(first, last, pred);
+    return i != last;
+}
+
+template<class C> inline C& sort(C& c) { std::sort(c.begin(), c.end()); return c; }
+template<class C, class P> inline C& sort(C& c, const P& pred) { std::sort(c.begin(), c.end(), pred); return c; }
+
+template<class C> inline bool contains(const C& c, const typename C::value_type& value) { return contains(c.begin(), c.end(), value); }
+template<class C, class P> inline bool containsIf(const C& c, P pred) { return containsIf(c.begin(), c.end(), pred); }
+
+template<class C, class T> inline typename C::iterator find(C& c, const T& v) { return std::find(c.begin(), c.end(), v); }
+template<class C, class T> inline typename C::const_iterator find(const C& c, const T& v) { return std::find(c.begin(), c.end(), v); }
+
+template<class C, class P> inline typename C::iterator findIf(C& c, const P& pred) { return std::find_if(c.begin(), c.end(), pred); }
+template<class C, class P> inline typename C::const_iterator findIf(const C& c, const P& pred) { return std::find_if(c.begin(), c.end(), pred); }
+template<class C> inline int findIndex(const C& c, const typename C::value_type& v)
+{
+    for(int i = 0; i < int(c.size()); ++i)
+        if (v == c[i])
+            return i;
+    return -1;
+}
+template<class C, class P> inline int findIndexIf(const C& c, const P& pred)
+{
+    for(int i = 0; i < int(c.size()); ++i)
+        if (pred(c[i]))
+            return i;
+    return -1;
+}
+template<class C, class P> inline int rfindIndexIf(const C& c, const P& pred)
+{
+    for(int i = int(c.size()) - 1; i >= 0; --i)
+        if (pred(c[i]))
+            return i;
+    return -1;
+}
+
+template<class C, class F> C& forEach(C& c, F f) { std::for_each(c.begin(), c.end(), f); return c; }
+template<class C, class F> const C& forEach(const C& c, F f) { std::for_each(c.begin(), c.end(), f); return c; }
+template<class C, typename T> inline void fill(C& c, const T& value) { std::fill(c.begin(), c.end(), value); }
+
+template<class C, class It> It copy(C& c, It to) { return std::copy(c.begin(), c.end(), to); }
+
+//template<class C, class P> C select(const C& v, P pred)
+
+template<class T, class P> QVector<int> selectIndexes(const QVector<T>& v, P pred)
+{
+    QVector<int> r;
+    for(int i = 0; i < int(v.size()); ++i)
+        if (pred(v[i]))
+            r << i;
+    return r;
+}
+
+template<class C, class P> inline int countIf(const C &c, const P &pred) { return std::count_if(c.begin(), c.end(), pred); }
+}
+
+// Returns pointer to value if the variant holds T, otherwise nullptr
+template<typename T, typename Variant>
+inline decltype(auto) get_if_type(Variant& v) {
+    return std::holds_alternative<T>(v) ? std::addressof(std::get<T>(v)) : nullptr;
+}
+
+template<typename T, typename Variant>
+inline const T* get_if_polymorphic(const Variant& v) {
+    if (const auto* p = dynamic_cast<const T*>(std::addressof(v))) {
+        return p;
+    }
+    return nullptr;
+}
+
+const QString DateFormat = "dd.MM.yyyy", DtFormat = "dd.MM.yyyy HH:mm", DtFormatSec = "dd.MM.yyyy HH:mm:ss", DtFormatSecMsec = "ss:zzz";
+
+bool isRu();
+
+//inline QDate nowd() { return QDate::currentDate(); }
+inline QTime nowt() { return QTime::currentTime(); }
+inline QDateTime now() { return QDateTime::currentDateTime(); }
+//inline QDateTime nowutc() { return QDateTime::currentDateTimeUtc(); }
+//inline QDateTime today() { return QDateTime(nowd()); }
+
+inline QString nowstr() { return now().toString(DtFormatSec); }
+//inline QString nowdstr() { return nowd().toString(DateFormat); }
+inline QString nowtstr() { return nowt().toString("hh:mm:ss"); }
+
+QString makeHash(const QString& password);
+bool testPassword(const QByteArray& password, const QByteArray& passwordHash);
+
+//inline QDebug qs() { return qDebug().nospace(); }
+//inline QDebug qq() { return qDebug().noquote(); }
+
+//QByteArray calcHash(const QStringList& list);
+
+inline int compareNoCase(const QString& a, const QString& b) { return a.compare(b, Qt::CaseInsensitive); }
+
+int findFirstNotOf(const QString& s, const char* chars, int pos = 0, int n = -1);
+int findFirstNotOf(const QString& s, QChar c, int pos = 0, int n = -1);
+
+inline void noCaseSort(QStringList& list)
+{ std::sort(list.begin(), list.end(), [](const QString& a, const QString& b) { int r = compareNoCase(a, b); return r == 0 ? (a < b) : r < 0; }); }
+
+QByteArray& trimLeft(QByteArray& s, char c);
+QByteArray& trimRight(QByteArray& s, char c);
+inline QByteArray& trim(QByteArray& s, char c) { return trimLeft(trimRight(s, c), c); }
+
+QByteArray& trimLeft(QByteArray& s, const char* chars); // ascii only
+QByteArray& trimRight(QByteArray& s, const char* chars); // ascii only
+inline QByteArray& trim(QByteArray& s, const char* chars) { return trimLeft(trimRight(s, chars), chars); }
+
+QString& trimLeft(QString& s, QChar c);
+QString& trimRight(QString& s, QChar c);
+inline QString& trim(QString& s, QChar c) { return trimLeft(trimRight(s, c), c); }
+
+//QString& trimLeft(QString& s, const char* chars); // ascii only
+//QString& trimRight(QString& s, const char* chars); // ascii only
+//inline QString& trim(QString& s, const char* chars) { return trimLeft(trimRight(s, chars), chars); }
+
+//QString& trimLeft(QString& s, const char16_t* chars);
+//QString& trimRight(QString& s, const char16_t* chars);
+//inline QString& trim(QString& s, const char* chars) { return trimLeft(trimRight(s, chars), chars); }
+
+QString& append(QString& s, const QVector<int>& v, QChar sep);
+inline QString join(const QVector<int>& v, QChar sep)
+{
+    QString s;
+    append(s, v, sep);
+    return s;
+}
+QString &append(QString &s, const QVector<QByteArray> &v, QChar sep);
+QVector<int> splitToInts(const QString& s, QChar sep);
+
+QVector<QHostAddress> getIpAddr();
+
+QVector<bool> convertStringToVectorBool(const QString &string);
+QByteArray addSizeToByteArray(const QByteArray &arr);
+int getSizeJsonInByteArr(const QByteArray &arr);
+QString toString(const QVector<bool> &vec, bool value);
+//Counts values in bool vectors
+int popCount(const QVector<bool> &vec, bool value);
+QVector<bool> vectorOr(const QVector<bool> &a, const QVector<bool> &b);
+QVector<bool> invert(const QVector<bool> &v);
+
+QString execAndReadAll(const QString& prog, const QStringList& args, const QString& workDir, int waitTimeout = 0, bool ignoreErrorOut = false);
+inline QString execAndReadAll1(const QString& prog, const QString& arg, int waitTimeout = 0, bool ignoreErrorOut = false) { return execAndReadAll(prog, QStringList(arg), {}, waitTimeout, ignoreErrorOut); }
+
+QRegularExpressionMatch paCardMatchSinks();
+QRegularExpressionMatch paPciMatchSinks();
+QByteArray getPaUsbOutput();
+QByteArray getPaUsbInput();
+bool isUsbAudioCardPresent();
+QByteArray getDefaultAudioInput();
+QByteArray getDefaultAudioOutput();
+QByteArray getDefaultAudioInputStr();
+QByteArray getDefaultAudioOutputStr();
+
+QByteArray getMachineId();
+
+inline QString qStrFromBA(const QByteArray& chaddr) { return QString::fromUtf8(chaddr.left(6).toHex(':')); }
+#ifndef Q_OS_WINDOWS
+bool getVersion();
+#endif
+
+QJsonArray convertVectorToJsonArray(const QVector<bool> &vector);
+QVector<bool> convertJsonArrayToVector(const QJsonArray &array);
+
+QByteArray toCbor(const QJsonObject &jsonObject);
+QByteArray toCbor(const QJsonArray &jsonArray);
+QByteArray toCbor(const QJsonDocument &doc);
+QJsonDocument fromCbor(const QByteArray &cborData);
+
+QVector<int> arrayFromMask(uint8_t mask);
+QVector<int> intersectUnique(const QVector<int>& a, const QVector<int>& b);
diff --git a/src/LicenseGenerator/crypt.cpp b/src/LicenseGenerator/crypt.cpp
new file mode 100644
index 0000000..909dc2e
--- /dev/null
+++ b/src/LicenseGenerator/crypt.cpp
@@ -0,0 +1,478 @@
+#include "crypt.h"
+#include <cmath>
+#include <openssl/pem.h>
+#include <openssl/bio.h>
+#include <openssl/rsa.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+#include <QDebug>
+#include <QDataStream>
+
+QPair<QByteArray, QByteArray> Crypt::generateRSAKeyPair() {
+    QPair<QByteArray, QByteArray> keyPair;
+    EVP_PKEY *keypair = nullptr;
+    EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, nullptr);
+
+    if (!ctx || EVP_PKEY_keygen_init(ctx) <= 0 || EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, 2048) <= 0) {
+        qDebug() << "Failed to initialize RSA key generation context";
+        EVP_PKEY_CTX_free(ctx);
+        return keyPair;
+    }
+
+    if (EVP_PKEY_keygen(ctx, &keypair) <= 0) {
+        qDebug() << "Failed to generate RSA key pair";
+        EVP_PKEY_CTX_free(ctx);
+        return keyPair;
+    }
+
+    // Convert private key to DER format
+    BIO *privateBio = BIO_new(BIO_s_mem());
+    if (i2d_PrivateKey_bio(privateBio, keypair) <= 0) {
+        qDebug() << "Failed to write private key in DER format";
+        EVP_PKEY_free(keypair);
+        BIO_free(privateBio);
+        EVP_PKEY_CTX_free(ctx);
+        return keyPair;
+    }
+    char *privateData = nullptr;
+    long privateLen = BIO_get_mem_data(privateBio, &privateData);
+    keyPair.first = QByteArray(privateData, privateLen);
+    BIO_free(privateBio);
+
+    // Convert public key to DER format
+    BIO *publicBio = BIO_new(BIO_s_mem());
+    if (i2d_PUBKEY_bio(publicBio, keypair) <= 0) {
+        qDebug() << "Failed to write public key in DER format";
+        EVP_PKEY_free(keypair);
+        BIO_free(publicBio);
+        EVP_PKEY_CTX_free(ctx);
+        return keyPair;
+    }
+    char *publicData = nullptr;
+    long publicLen = BIO_get_mem_data(publicBio, &publicData);
+    keyPair.second = QByteArray(publicData, publicLen);
+    BIO_free(publicBio);
+
+    EVP_PKEY_free(keypair);
+    EVP_PKEY_CTX_free(ctx);
+    return keyPair;
+}
+
+QByteArray Crypt::generateAESKey() {
+    QByteArray aesKey(32, 0);  // 32 bytes for AES-256
+    if (!RAND_bytes(reinterpret_cast<unsigned char*>(aesKey.data()), aesKey.size())) {
+        qDebug() << "Failed to generate AES key";
+    }
+    return aesKey;
+}
+
+bool Crypt::encryptAESKeyWithRSA(EVP_PKEY *publicKey, const unsigned char *aesKey, size_t aesKeyLength, QByteArray &encryptedKey) {
+    encryptedKey.resize(256);  // For RSA 2048-bit
+    size_t encryptedKeyLength = encryptedKey.size();
+
+    EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(publicKey, nullptr);
+    if (!ctx || EVP_PKEY_encrypt_init(ctx) <= 0) {
+        qDebug() << "Failed to initialize RSA encryption";
+        EVP_PKEY_CTX_free(ctx);
+        return false;
+    }
+
+    EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_OAEP_PADDING);
+    if (EVP_PKEY_encrypt(ctx, reinterpret_cast<unsigned char*>(encryptedKey.data()), &encryptedKeyLength, aesKey, aesKeyLength) <= 0) {
+        qDebug() << "RSA encryption failed";
+        EVP_PKEY_CTX_free(ctx);
+        ERR_print_errors_fp(stderr);
+        return false;
+    }
+    encryptedKey.resize(encryptedKeyLength);
+    EVP_PKEY_CTX_free(ctx);
+    return true;
+}
+
+Crypt::EncryptedData Crypt::encrypt(const QByteArray &plaintext, const QByteArray &publicKey, const QByteArray &aesKey) {
+    EncryptedData result;
+
+    EVP_PKEY *evpPublicKey = loadKeyFromDER(publicKey, true);
+    if (!evpPublicKey) {
+        return result;
+    }
+
+    // Generate random IV
+    result.iv.resize(12);  // GCM standard recommends a 12-byte IV
+    if (!RAND_bytes(reinterpret_cast<unsigned char*>(result.iv.data()), result.iv.size())) {
+        qDebug() << "Failed to generate random IV";
+        EVP_PKEY_free(evpPublicKey);
+        return result;
+    }
+
+    // Encrypt the AES key with RSA public key
+    if (!encryptAESKeyWithRSA(evpPublicKey, reinterpret_cast<const unsigned char*>(aesKey.data()), aesKey.size(), result.encryptedKey)) {
+        qDebug() << "Failed to encrypt AES key with RSA";
+        EVP_PKEY_free(evpPublicKey);
+        return result;
+    }
+    EVP_PKEY_free(evpPublicKey);  // Free the EVP_PKEY structure for the public key
+
+    // AES-GCM encryption of the plaintext
+    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
+    if (!ctx) {
+        qDebug() << "Failed to create encryption context";
+        return result;
+    }
+
+    if (EVP_EncryptInit_ex(ctx, EVP_aes_256_gcm(), nullptr, nullptr, nullptr) <= 0 ||
+        EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, result.iv.size(), nullptr) <= 0 ||
+        EVP_EncryptInit_ex(ctx, nullptr, nullptr, reinterpret_cast<const unsigned char*>(aesKey.data()), reinterpret_cast<const unsigned char*>(result.iv.data())) <= 0) {
+        qDebug() << "Failed to initialize AES-GCM encryption";
+        EVP_CIPHER_CTX_free(ctx);
+        return result;
+    }
+
+    // Encrypt the plaintext
+    QByteArray ciphertext(plaintext.size() + EVP_CIPHER_block_size(EVP_aes_256_gcm()), 0);
+    int len = 0, ciphertext_len = 0;
+    if (EVP_EncryptUpdate(ctx, reinterpret_cast<unsigned char*>(ciphertext.data()), &len, reinterpret_cast<const unsigned char*>(plaintext.data()), plaintext.size()) <= 0) {
+        qDebug() << "AES-GCM encryption failed at Update step";
+        EVP_CIPHER_CTX_free(ctx);
+        return result;
+    }
+    ciphertext_len += len;
+
+    // Finalize encryption
+    if (EVP_EncryptFinal_ex(ctx, reinterpret_cast<unsigned char*>(ciphertext.data()) + len, &len) <= 0) {
+        qDebug() << "AES-GCM encryption failed at Final step";
+        EVP_CIPHER_CTX_free(ctx);
+        return result;
+    }
+    ciphertext_len += len;
+    ciphertext.resize(ciphertext_len);
+    result.encryptedData = ciphertext;
+
+    // Get the GCM authentication tag
+    result.tag.resize(16);  // Standard GCM tag length is 16 bytes
+    if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, result.tag.size(), result.tag.data()) <= 0) {
+        qDebug() << "Failed to retrieve GCM tag";
+        EVP_CIPHER_CTX_free(ctx);
+        return result;
+    }
+
+    EVP_CIPHER_CTX_free(ctx);
+    return result;
+}
+
+bool Crypt::decryptAESKeyWithRSA(EVP_PKEY *privateKey, const QByteArray &encryptedKey, unsigned char *aesKey, size_t aesKeyLength) {
+    // Ensure the buffer size is set to the RSA key size (e.g., 256 bytes for a 2048-bit RSA key)
+    unsigned char decryptedBuffer[256];  // Adjust size according to RSA key length, e.g., 256 bytes for RSA 2048-bit
+    size_t decryptedBufferSize = sizeof(decryptedBuffer);
+
+    EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(privateKey, nullptr);
+    if (!ctx || EVP_PKEY_decrypt_init(ctx) <= 0) {
+        qDebug() << "Failed to initialize RSA decryption";
+        EVP_PKEY_CTX_free(ctx);
+        return false;
+    }
+
+    // Set RSA padding to OAEP, which is recommended for encrypting small data such as AES keys
+    if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_OAEP_PADDING) <= 0) {
+        qDebug() << "Failed to set RSA padding";
+        EVP_PKEY_CTX_free(ctx);
+        return false;
+    }
+
+    // Perform RSA decryption into the `decryptedBuffer`
+    if (EVP_PKEY_decrypt(ctx, decryptedBuffer, &decryptedBufferSize, reinterpret_cast<const unsigned char*>(encryptedKey.data()), encryptedKey.size()) <= 0) {
+        qDebug() << "RSA decryption failed";
+        EVP_PKEY_CTX_free(ctx);
+        ERR_print_errors_fp(stderr);  // Print detailed OpenSSL error messages
+        return false;
+    }
+
+    // Check if the decrypted data fits the expected AES key size
+    if (decryptedBufferSize < aesKeyLength) {
+        qDebug() << "Decrypted data is too small for AES key";
+        EVP_PKEY_CTX_free(ctx);
+        return false;
+    }
+
+    // Copy only the first `aesKeyLength` bytes to `aesKey`
+    memcpy(aesKey, decryptedBuffer, aesKeyLength);
+    EVP_PKEY_CTX_free(ctx);
+    return true;
+}
+
+QByteArray Crypt::decrypt(const EncryptedData &encryptedData, const QByteArray &privateKey) {
+    QByteArray decryptedText;
+
+    EVP_PKEY *evpPrivateKey = loadKeyFromDER(privateKey, false);
+    if (!evpPrivateKey) {
+        return QByteArray();
+    }
+
+    // Decrypt the AES key using RSA private key
+    unsigned char aesKey[32];  // Buffer to hold the 32-byte AES key
+    if (!decryptAESKeyWithRSA(evpPrivateKey, encryptedData.encryptedKey, aesKey, sizeof(aesKey))) {
+        qDebug() << "Failed to decrypt AES key with RSA";
+        EVP_PKEY_free(evpPrivateKey);
+        return QByteArray();
+    }
+    EVP_PKEY_free(evpPrivateKey);  // Free the EVP_PKEY structure for the private key
+
+    // AES-GCM decryption
+    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
+    if (!ctx) {
+        qDebug() << "Failed to create decryption context";
+        return QByteArray();
+    }
+
+    // Initialize decryption with AES-256-GCM
+    if (EVP_DecryptInit_ex(ctx, EVP_aes_256_gcm(), nullptr, nullptr, nullptr) <= 0 ||
+        EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, encryptedData.iv.size(), nullptr) <= 0 ||
+        EVP_DecryptInit_ex(ctx, nullptr, nullptr, aesKey, reinterpret_cast<const unsigned char*>(encryptedData.iv.data())) <= 0) {
+        qDebug() << "Failed to initialize AES-GCM decryption";
+        EVP_CIPHER_CTX_free(ctx);
+        return QByteArray();
+    }
+
+    // Decrypt the encrypted data
+    decryptedText.resize(encryptedData.encryptedData.size());
+    int len = 0, plaintext_len = 0;
+    if (EVP_DecryptUpdate(ctx, reinterpret_cast<unsigned char*>(decryptedText.data()), &len,
+                          reinterpret_cast<const unsigned char*>(encryptedData.encryptedData.data()), encryptedData.encryptedData.size()) <= 0) {
+        qDebug() << "AES-GCM decryption failed at Update step";
+        EVP_CIPHER_CTX_free(ctx);
+        return QByteArray();
+    }
+    plaintext_len += len;
+
+    // Set the expected tag for verification
+    if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, encryptedData.tag.size(),
+                            const_cast<unsigned char*>(reinterpret_cast<const unsigned char*>(encryptedData.tag.data()))) <= 0) {
+        qDebug() << "Failed to set GCM tag for verification";
+        EVP_CIPHER_CTX_free(ctx);
+        return QByteArray();
+    }
+
+    // Finalize decryption and verify tag
+    if (EVP_DecryptFinal_ex(ctx, reinterpret_cast<unsigned char*>(decryptedText.data()) + plaintext_len, &len) <= 0) {
+        qDebug() << "Tag verification failed or decryption unsuccessful";
+        EVP_CIPHER_CTX_free(ctx);
+        return QByteArray();
+    }
+    plaintext_len += len;
+
+    EVP_CIPHER_CTX_free(ctx);
+    decryptedText.resize(plaintext_len);  // Adjust the QByteArray to the actual plaintext length
+
+    return decryptedText;
+}
+
+QByteArray Crypt::decrypt(const QByteArray &encryptedData, const QByteArray &privateKey)
+{
+    EncryptedData ed;
+    QDataStream ds(encryptedData);
+    ds >> ed;
+    return decrypt(ed, privateKey);
+}
+
+bool Crypt::isValidPublicKeyDER(const QByteArray &derKeyData)
+{
+    // Create a memory BIO from the QByteArray
+    BIO *bio = BIO_new_mem_buf(derKeyData.constData(), derKeyData.size());
+    if (!bio) {
+        qWarning("Failed to create BIO");
+        return false;
+    }
+
+    // Attempt to decode the DER-encoded data as a public key
+    EVP_PKEY *pkey = d2i_PUBKEY_bio(bio, nullptr);
+    BIO_free(bio);  // Free the BIO after use
+
+    bool isValid = (pkey != nullptr);  // If pkey is non-null, it’s a valid key
+    if (pkey) {
+        EVP_PKEY_free(pkey);  // Free the EVP_PKEY structure if it was valid
+    }
+
+    return isValid;
+}
+
+QByteArray Crypt::rsaDecrypt(const QByteArray &encryptedData, const QByteArray &publicKey)
+{
+    EVP_PKEY *pkey = loadKeyFromDER(publicKey, true);
+    if (!pkey) {
+        return QByteArray();
+    }
+    EVP_PKEY_CTX* ctx = EVP_PKEY_CTX_new(pkey, nullptr);
+    if (!ctx) {
+        EVP_PKEY_free(pkey);
+        qDebug() << "Failed to create EVP_PKEY_CTX for decryption.";
+        ERR_print_errors_fp(stderr);
+        return QByteArray();
+    }
+
+    const int key_bits =
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+        EVP_PKEY_bits(pkey);
+#else
+        EVP_PKEY_get_bits(pkey);
+#endif
+    qDebug() << "Key bits" << key_bits;
+    EVP_PKEY_free(pkey);
+    int chunkSize = key_bits / 8;
+
+    if (EVP_PKEY_verify_recover_init(ctx) <= 0) {
+        qDebug() << "Failed to initialize verification context.";
+        ERR_print_errors_fp(stderr);
+        EVP_PKEY_CTX_free(ctx);
+        return QByteArray();
+    }
+
+    if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0) {
+        qDebug() << "Failed to set RSA padding.";
+        ERR_print_errors_fp(stderr);
+        EVP_PKEY_CTX_free(ctx);
+        return QByteArray();
+    }
+
+    QByteArray ret;
+    for (int i = 0; i < encryptedData.size() / chunkSize; ++i) {
+        int offset = i * chunkSize;
+        QByteArray chunk = encryptedData.mid(offset, chunkSize);
+        size_t out_len = 0;
+        if (EVP_PKEY_verify_recover(ctx, nullptr, &out_len, reinterpret_cast<const unsigned char *>(chunk.data()), chunk.size()) <= 0) {
+            qDebug() << "Failed to determine decrypted data size.";
+            ERR_print_errors_fp(stderr);
+            EVP_PKEY_CTX_free(ctx);
+            return QByteArray();
+        }
+
+        QByteArray decrypted;
+        decrypted.resize(out_len);
+        if (EVP_PKEY_verify_recover(ctx, reinterpret_cast<unsigned char *>(decrypted.data()), &out_len, reinterpret_cast<const unsigned char *>(chunk.data()), chunk.size()) <= 0) {
+            qDebug() << "Verification (decryption) failed.";
+            ERR_print_errors_fp(stderr);
+            EVP_PKEY_CTX_free(ctx);
+            return QByteArray();
+        }
+        decrypted.resize(out_len);
+        ret.append(decrypted);
+    }
+
+    EVP_PKEY_CTX_free(ctx);
+    return ret;
+}
+
+QByteArray Crypt::rsaEncrypt(const QByteArray &data, const QByteArray &privateKey)
+{
+    EVP_PKEY *pkey = loadKeyFromDER(privateKey, false);
+    if (!pkey) {
+        return QByteArray();
+    }
+    EVP_PKEY_CTX* ctx = EVP_PKEY_CTX_new(pkey, nullptr);
+    if (!ctx) {
+        qDebug() << "Failed to create EVP_PKEY_CTX for encryption.";
+        EVP_PKEY_free(pkey);
+        ERR_print_errors_fp(stderr);
+        return QByteArray();
+    }
+
+    const int keySize =
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+    EVP_PKEY_size(pkey);
+#else
+   EVP_PKEY_get_size(pkey);
+#endif
+    const int chunkSize = keySize - RSA_PKCS1_PADDING_SIZE;
+    EVP_PKEY_free(pkey);
+    if (chunkSize <= 0) {
+        qDebug() << "Invalid RSA key size for PKCS1 padding.";
+        EVP_PKEY_CTX_free(ctx);
+        return QByteArray();
+    }
+
+    if (EVP_PKEY_sign_init(ctx) <= 0) {
+        qDebug() << "Failed to initialize signing context.";
+        ERR_print_errors_fp(stderr);
+        EVP_PKEY_CTX_free(ctx);
+        return QByteArray();
+    }
+
+    if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0) {
+        qDebug() << "Failed to set RSA padding.";
+        ERR_print_errors_fp(stderr);
+        EVP_PKEY_CTX_free(ctx);
+        return QByteArray();
+    }
+
+    QByteArray ret;
+    for (int i = 0; i < ceil(data.size() * 1. / chunkSize); ++i) {
+        int offset = i * chunkSize;
+        QByteArray chunk = data.mid(offset, chunkSize);
+        size_t out_len = 0;
+        if (EVP_PKEY_sign(ctx, nullptr, &out_len, reinterpret_cast<const unsigned char*>(chunk.data()), chunk.size()) <= 0) {
+            qDebug() << "Failed to determine signature size.";
+            ERR_print_errors_fp(stderr);
+            EVP_PKEY_CTX_free(ctx);
+            return QByteArray();
+        }
+        QByteArray encryptedChunk(out_len, 0);
+        if (EVP_PKEY_sign(ctx, reinterpret_cast<unsigned char *>(encryptedChunk.data()), &out_len, reinterpret_cast<const unsigned char*>(chunk.data()), chunk.size()) <= 0) {
+            qDebug() << "Signing (encryption) failed.\n";
+            ERR_print_errors_fp(stderr);
+            EVP_PKEY_CTX_free(ctx);
+            return QByteArray();
+        }
+        encryptedChunk.resize(out_len);
+        ret.append(encryptedChunk);
+    }
+    EVP_PKEY_CTX_free(ctx);
+    return ret;
+}
+
+QByteArray Crypt::encryptToByteArray(const QByteArray &plaintext, const QByteArray &publicKey, const QByteArray &aesKey)
+{
+    EncryptedData ed = encrypt(plaintext, publicKey, aesKey);
+    if (ed.isEmpty())
+        return QByteArray();
+    QByteArray ret;
+    QDataStream ds(&ret, QIODevice::WriteOnly);
+    ds << ed;
+    return ret;
+}
+
+EVP_PKEY *Crypt::loadKeyFromDER(const QByteArray &derKey, bool isPublicKey) {
+    // Create a memory BIO from the QByteArray
+    BIO *bio = BIO_new_mem_buf(derKey.constData(), derKey.size());
+    if (!bio) {
+        qWarning("Failed to create BIO");
+        return nullptr;
+    }
+
+    // Load the key based on whether it's a public or private key
+    EVP_PKEY *key = isPublicKey ? d2i_PUBKEY_bio(bio, nullptr) : d2i_PrivateKey_bio(bio, nullptr);
+    BIO_free(bio);  // Free the BIO after loading
+
+    if (!key) {
+        qDebug() << "Failed to load key. SSL error:";
+        ERR_print_errors_fp(stderr);
+    }
+
+    return key;
+}
+
+QDataStream &operator<< (QDataStream &ds, const Crypt::EncryptedData &data)
+{
+    ds << data.encryptedData;
+    ds << data.iv;
+    ds << data.encryptedKey;
+    ds << data.tag;
+    return ds;
+}
+
+QDataStream &operator>> (QDataStream &ds, Crypt::EncryptedData &data)
+{
+    ds >> data.encryptedData;
+    ds >> data.iv;
+    ds >> data.encryptedKey;
+    ds >> data.tag;
+    return ds;
+}
diff --git a/src/LicenseGenerator/crypt.h b/src/LicenseGenerator/crypt.h
new file mode 100644
index 0000000..8333123
--- /dev/null
+++ b/src/LicenseGenerator/crypt.h
@@ -0,0 +1,41 @@
+#ifndef CRYPT_H
+#define CRYPT_H
+
+#include <openssl/evp.h>
+
+#include <QByteArray>
+#include <QPair>
+
+class Crypt
+{
+    static bool encryptAESKeyWithRSA(EVP_PKEY *publicKey, const unsigned char *aesKey, size_t aesKeyLength, QByteArray &encryptedKey);
+    static bool decryptAESKeyWithRSA(EVP_PKEY *privateKey, const QByteArray &encryptedKey, unsigned char *aesKey, size_t aesKeyLength);
+    static EVP_PKEY *loadKeyFromDER(const QByteArray &derPrivateKey, bool isPublicKey);
+
+public:
+
+    struct EncryptedData {
+        QByteArray encryptedData;
+        QByteArray iv;
+        QByteArray encryptedKey;
+        QByteArray tag;
+
+        int size() { return encryptedData.size() + iv.size() + encryptedKey.size() + tag.size(); }
+        bool isEmpty() { return encryptedData.isEmpty(); }
+    };
+
+    static QPair<QByteArray, QByteArray> generateRSAKeyPair();
+    static QByteArray generateAESKey();
+    static EncryptedData encrypt(const QByteArray &plaintext, const QByteArray &publicKey, const QByteArray &aesKey);
+    static QByteArray encryptToByteArray(const QByteArray &plaintext, const QByteArray &publicKey, const QByteArray &aesKey);
+    static QByteArray decrypt(const EncryptedData &encryptedData, const QByteArray &privateKey);
+    static QByteArray decrypt(const QByteArray &encryptedData, const QByteArray &privateKey);
+    static bool isValidPublicKeyDER(const QByteArray& derKeyData);
+    static QByteArray rsaDecrypt(const QByteArray &encryptedData, const QByteArray &publicKey);
+    static QByteArray rsaEncrypt(const QByteArray &data, const QByteArray &privateKey);
+};
+
+QDataStream &operator<< (QDataStream &ds, const Crypt::EncryptedData &data);
+QDataStream &operator>> (QDataStream &ds, Crypt::EncryptedData &data);
+
+#endif // CRYPT_H
diff --git a/src/LicenseModel/LicenseModel.cpp b/src/LicenseModel/LicenseModel.cpp
index 541e3b5..6fa1e2c 100644
--- a/src/LicenseModel/LicenseModel.cpp
+++ b/src/LicenseModel/LicenseModel.cpp
@@ -13,7 +13,7 @@
 // Self
 #include "../def.h"
 
-const static int COLUMN_COUNT = 8;
+const static int COLUMN_COUNT = 9;
 
 LicenseModel::LicenseModel(QObject* parent)
     : QAbstractItemModel(parent)
@@ -59,6 +59,8 @@ QVariant LicenseModel::data(const QModelIndex &index, int role) const
     case 6:
         return m_data[index.row()].city ;
     case 7:
+        return m_data[index.row()].licenseTime.isEmpty() ? tr("Permanent") : m_data[index.row()].licenseTime ;
+    case 8:
         return m_data[index.row()].comment ;
     default:
         return {};
@@ -90,6 +92,8 @@ QVariant LicenseModel::headerData(int section, Qt::Orientation orientation, int
     case 6:
         return tr("City");
     case 7:
+        return tr("License time");
+    case 8:
         return tr("Comment");
     default:
         return {};
@@ -220,6 +224,7 @@ void LicenseModel::addClient(const LicenseItem &item)
             m_status = Status::DbStructError;
             m_errors.append("Inserted client not found");
             emit statusChanged();
+            qDebug() << m_errors;
             watcher->deleteLater();
             return;
         }
@@ -250,8 +255,8 @@ void LicenseModel::addClient(const LicenseItem &item)
             {
                 QSqlQuery queryInsert(db);
                 queryInsert.prepare(QString(
-                    "INSERT INTO clients(lastName, firstName, patronymic, phone, email, city, yourCompany, hardwareHash, comment) "
-                    "VALUES (:lastName, :firstName, :patronymic, :phone, :email, :city, :yourCompany, :hardwareHash, :comment);"
+                    "INSERT INTO clients(lastName, firstName, patronymic, phone, email, city, yourCompany, hardwareHash, licenseTime, comment) "
+                    "VALUES (:lastName, :firstName, :patronymic, :phone, :email, :city, :yourCompany, :hardwareHash, :licenseTime, :comment);"
                 ));
                 queryInsert.bindValue(":lastName", item.lastName);
                 queryInsert.bindValue(":firstName", item.firstName);
@@ -261,12 +266,14 @@ void LicenseModel::addClient(const LicenseItem &item)
                 queryInsert.bindValue(":city", item.city);
                 queryInsert.bindValue(":yourCompany", item.yourCompany);
                 queryInsert.bindValue(":hardwareHash", item.hardwareHash);
+                queryInsert.bindValue(":licenseTime", item.licenseTime);
                 queryInsert.bindValue(":comment", item.comment);
 
                 if (!queryInsert.exec())
                 {
                     result.status = LicenseModel::Status::DbStructError;
                     result.error = queryInsert.lastError().text();
+                    qDebug() << result.error;
                 }
                 else
                 {
@@ -298,10 +305,8 @@ void LicenseModel::addClient(const LicenseItem &item)
                         output.city = querySelect.value("city").toString();
                         output.yourCompany = querySelect.value("yourCompany").toString();
                         output.hardwareHash = querySelect.value("hardwareHash").toString();
+                        output.licenseTime = querySelect.value("licenseTime").toString();
                         output.comment = querySelect.value("comment").toString();
-                        const int createdAtUtcIndex = querySelect.record().indexOf("createdAtUtc");
-                        if (createdAtUtcIndex >= 0)
-                            output.createdAtUtc = querySelect.value(createdAtUtcIndex).toString();
                         result.data.append(output);
                     }
                 }
@@ -425,8 +430,6 @@ void LicenseModel::editClient(const LicenseItem &item, int index)
 
     LicenseItem updateItem = item;
     updateItem.id = m_data[index].id;
-    if (updateItem.createdAtUtc.isEmpty())
-        updateItem.createdAtUtc = m_data[index].createdAtUtc;
 
     if (updateItem.id.isEmpty())
     {
@@ -491,7 +494,7 @@ void LicenseModel::editClient(const LicenseItem &item, int index)
                 queryUpdate.prepare(QString(
                     "UPDATE clients SET lastName=:lastName, firstName=:firstName, patronymic=:patronymic, "
                     "phone=:phone, email=:email, city=:city, yourCompany=:yourCompany, hardwareHash=:hardwareHash, "
-                    "comment=:comment WHERE id=:id;"
+                    "licenseTime=:licenseTime, comment=:comment WHERE id=:id;"
                 ));
                 queryUpdate.bindValue(":lastName", updateItem.lastName);
                 queryUpdate.bindValue(":firstName", updateItem.firstName);
@@ -501,6 +504,7 @@ void LicenseModel::editClient(const LicenseItem &item, int index)
                 queryUpdate.bindValue(":city", updateItem.city);
                 queryUpdate.bindValue(":yourCompany", updateItem.yourCompany);
                 queryUpdate.bindValue(":hardwareHash", updateItem.hardwareHash);
+                queryUpdate.bindValue(":licenseTime", updateItem.licenseTime);
                 queryUpdate.bindValue(":comment", updateItem.comment);
                 queryUpdate.bindValue(":id", updateItem.id);
 
@@ -537,12 +541,8 @@ void LicenseModel::editClient(const LicenseItem &item, int index)
                         output.city = querySelect.value("city").toString();
                         output.yourCompany = querySelect.value("yourCompany").toString();
                         output.hardwareHash = querySelect.value("hardwareHash").toString();
+                        output.licenseTime = querySelect.value("licenseTime").toString();
                         output.comment = querySelect.value("comment").toString();
-                        const int createdAtUtcIndex = querySelect.record().indexOf("createdAtUtc");
-                        if (createdAtUtcIndex >= 0)
-                            output.createdAtUtc = querySelect.value(createdAtUtcIndex).toString();
-                        else
-                            output.createdAtUtc = updateItem.createdAtUtc;
                         result.data.append(output);
                     }
                 }
@@ -596,7 +596,7 @@ void LicenseModel::updateModel()
             {
                 QSqlQuery query(db);
                 if (!query.exec(
-                        "SELECT id, lastName, firstName, patronymic, phone, email, city, yourCompany, hardwareHash, comment "
+                        "SELECT id, lastName, firstName, patronymic, phone, email, city, yourCompany, hardwareHash, licenseTime, comment "
                         "FROM clients ORDER BY id DESC;"
                     ))
                 {
@@ -605,7 +605,6 @@ void LicenseModel::updateModel()
                 }
                 else
                 {
-                    const int createdAtUtcIndex = query.record().indexOf("createdAtUtc");
                     while (query.next())
                     {
                         LicenseItem item;
@@ -618,9 +617,8 @@ void LicenseModel::updateModel()
                         item.city = query.value("city").toString();
                         item.yourCompany = query.value("yourCompany").toString();
                         item.hardwareHash = query.value("hardwareHash").toString();
+                        item.licenseTime = query.value("licenseTime").toString();
                         item.comment = query.value("comment").toString();
-                        if (createdAtUtcIndex >= 0)
-                            item.createdAtUtc = query.value(createdAtUtcIndex).toString();
                         result.data.append(item);
                     }
                 }
diff --git a/src/LicenseModel/LicenseModel.h b/src/LicenseModel/LicenseModel.h
index f29f0dd..b48fc23 100644
--- a/src/LicenseModel/LicenseModel.h
+++ b/src/LicenseModel/LicenseModel.h
@@ -31,7 +31,7 @@ public:
         QString patronymic;
         QString phone;
         QString yourCompany;
-        QString createdAtUtc;
+        QString licenseTime;
         QString comment;
     };
 
diff --git a/src/MainWidget/MainWidget.cpp b/src/MainWidget/MainWidget.cpp
index 223dfb2..bdab7e0 100644
--- a/src/MainWidget/MainWidget.cpp
+++ b/src/MainWidget/MainWidget.cpp
@@ -3,13 +3,14 @@
 // Qt
 #include <QApplication>
 #include <QDebug>
+#include <QFileDialog>
 #include <QHeaderView>
-#include <QLabel>
 #include <QMenu>
 #include <QMessageBox>
 #include <QPushButton>
 #include <QSettings>
 #include <QStatusBar>
+#include <QStandardPaths>
 #include <QTableView>
 #include <QTimer>
 #include <QToolBar>
@@ -17,6 +18,8 @@
 
 // Self
 #include "../def.h"
+#include "LicenseGenerator/crypt.h"
+#include "LicenseGenerator/Util.h"
 #include "LicenseModel/LicenseModel.h"
 #include "EditClientDialog/EditClientDialog.h"
 
@@ -44,18 +47,28 @@ MainWidget::MainWidget(QWidget *parent)
     {
         if (m_licenseModel->getStatus() == LicenseModel::Status::DbStructError)
         {
-            if (!m_licenseModel->prepareDatabase())
-            {
-                QTimer::singleShot(0, [&]() {
-                    QMessageBox messageBox;
-                    messageBox.setIcon(QMessageBox::Critical);
-                    messageBox.setWindowTitle(tr("Error"));
-                    messageBox.setText(tr("Error with prepare database"));
-                    messageBox.setDetailedText(m_licenseModel->getStatusText());
-                    messageBox.exec();
+            QTimer::singleShot(0, [&]() {
+                auto result = QMessageBox::question(
+                    this
+                    , tr("Database not exist")
+                    , tr("Create new database?")
+                );
+                if (result == QMessageBox::Button::Yes)
+                {
+                    if (!m_licenseModel->prepareDatabase())
+                    {
+                        QMessageBox::critical(
+                            this
+                            , tr("Error")
+                            , tr("Database create error")
+                        );
+                    }
+                }
+                else if (result == QMessageBox::Button::No)
                     QApplication::quit();
-                });
-            }
+                else
+                    qDebug() << "result" << result;
+            });
         }
     }
 
@@ -94,11 +107,14 @@ MainWidget::MainWidget(QWidget *parent)
             m_addClientsMenuAction = m_menu->addAction(QIcon(QStringLiteral(":/deps/add.png")), tr("Add client"));
             m_editClientsMenuAction = m_menu->addAction(QIcon(QStringLiteral(":/deps/edit.png")), tr("Edit client"));
             m_deleteClientsMenuAction = m_menu->addAction(QIcon(QStringLiteral(":/deps/delete.png")), tr("Delete client"));
+            m_menu->addSeparator();
+            m_getLicenseFileAction = m_menu->addAction(QIcon(QStringLiteral(":/deps/getLicenseFile.png")), tr("Get license file"));
 
             connect(m_reloadTableMenuAction, &QAction::triggered, this, &MainWidget::onReloadTableTriggered);
             connect(m_addClientsMenuAction, &QAction::triggered, this, &MainWidget::onAddClientTriggered);
             connect(m_editClientsMenuAction, &QAction::triggered, this, &MainWidget::onEditClientTriggered);
             connect(m_deleteClientsMenuAction, &QAction::triggered, this, &MainWidget::onDeleteClientTriggered);
+            connect(m_getLicenseFileAction, &QAction::triggered, this, &MainWidget::onGetLicenseFileTriggered);
 
             m_tableView->setContextMenuPolicy(Qt::CustomContextMenu);
             connect(m_tableView, &QTableView::customContextMenuRequested,
@@ -199,6 +215,88 @@ void MainWidget::onDeleteClientTriggered()
         m_licenseModel->deleteClient(list);
 }
 
+void MainWidget::onGetLicenseFileTriggered()
+{
+    auto selectedRows = m_tableView->selectionModel()->selectedRows();
+    if (selectedRows.size() != 1)
+        return;
+
+    const int row = selectedRows.first().row();
+    const auto item = m_licenseModel->getItem(row);
+
+    QStringList nameParts;
+    if (!item.lastName.isEmpty())
+        nameParts << item.lastName;
+    if (!item.firstName.isEmpty())
+        nameParts << item.firstName;
+    if (!item.patronymic.isEmpty())
+        nameParts << item.patronymic;
+    if (nameParts.isEmpty() && !item.yourCompany.isEmpty())
+        nameParts << item.yourCompany;
+
+    QString baseName = nameParts.join('_');
+    if (baseName.isEmpty())
+        baseName = "license";
+    baseName.replace('/', '_');
+    baseName.replace('\\', '_');
+
+    QString baseDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
+    if (baseDir.isEmpty())
+        baseDir = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
+    const QString defaultPath = baseDir + "/" + baseName + ".dat";
+    QString filePath = QFileDialog::getSaveFileName(
+        this,
+        tr("Save license file"),
+        defaultPath,
+        tr("License files (*.license);;All files (*)")
+    );
+    if (filePath.isEmpty())
+        return;
+    if (!filePath.endsWith(".dat", Qt::CaseInsensitive))
+        filePath += ".dat";
+
+    QJsonObject licenseObject;
+    licenseObject.insert("machineId", item.hardwareHash);
+
+    if (!item.licenseTime.isEmpty())
+        licenseObject.insert("validUntil", QDate::fromString(item.licenseTime).toString(Qt::ISODate));
+
+    QJsonDocument doc(licenseObject);
+    const QByteArray data = doc.toJson(QJsonDocument::Indented);
+    const QByteArray privateKey = fileReadAll(":/deps/Key");
+    if (privateKey.isEmpty())
+    {
+        QMessageBox::warning(
+            this,
+            tr("Error"),
+            tr("Failed to load encryption key")
+        );
+        return;
+    }
+
+    QByteArray encrypted = Crypt::rsaEncrypt(toCbor(doc), privateKey);
+
+    QFile file(filePath);
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Truncate))
+    {
+        QMessageBox::warning(
+            this,
+            tr("Error"),
+            tr("Failed to open license file: %1").arg(file.errorString())
+        );
+        return;
+    }
+
+    if (file.write(encrypted.toHex()) != encrypted.toHex().size())
+    {
+        QMessageBox::warning(
+            this,
+            tr("Error"),
+            tr("Failed to write license file: %1").arg(file.errorString())
+        );
+    }
+}
+
 void MainWidget::selectionChanged()
 {
     auto selectedCount = m_tableView->selectionModel()->selectedRows().size();
@@ -208,6 +306,7 @@ void MainWidget::selectionChanged()
     m_addClientsMenuAction->setEnabled(m_licenseModel->getStatus() == LicenseModel::Status::Ok);
     m_editClientsMenuAction->setEnabled(selectedCount == 1 && m_licenseModel->getStatus() == LicenseModel::Status::Ok);
     m_deleteClientsMenuAction->setEnabled(selectedCount > 0 && m_licenseModel->getStatus() == LicenseModel::Status::Ok);
+    m_getLicenseFileAction->setEnabled(selectedCount == 1 && m_licenseModel->getStatus() == LicenseModel::Status::Ok);
 }
 
 void MainWidget::closeEvent(QCloseEvent *event)
@@ -282,4 +381,3 @@ void MainWidget::modelStatusChanged()
 
     selectionChanged();
 }
-
diff --git a/src/MainWidget/MainWidget.h b/src/MainWidget/MainWidget.h
index dcb9151..d1cf6c0 100644
--- a/src/MainWidget/MainWidget.h
+++ b/src/MainWidget/MainWidget.h
@@ -31,6 +31,7 @@ private slots:
     void onAddClientTriggered();
     void onEditClientTriggered();
     void onDeleteClientTriggered();
+    void onGetLicenseFileTriggered();
     void onEditClientDialogClosed(int result);
     void selectionChanged();
     void modelStatusChanged();
@@ -51,6 +52,7 @@ private:
     QAction* m_addClientsMenuAction{nullptr};
     QAction* m_deleteClientsMenuAction{nullptr};
     QAction* m_editClientsMenuAction{nullptr};
+    QAction* m_getLicenseFileAction{nullptr};
     EditClientDialog* m_editClientDialog{nullptr};
     QStatusBar* m_statusBar{nullptr};
     QLabel* m_statusLabel{nullptr};