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Olivier Moussalli
Olivier Moussalli

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Offline License Activation with QR Codes: Serving Air-Gapped Environments in C#

#csharp #security #licensing #enterprise

Your biggest enterprise deal just came in: a government contract worth $500K. Then you discover their security policy prohibits internet connections for classified systems. If your software requires online activation, that deal is dead.

Offline activation isn't a nice-to-have for enterprise software—it's a requirement for government, military, healthcare, financial, and industrial control system deployments. This article shows you how to implement secure offline activation with QR codes in C#.

Why Offline Activation Matters

Markets that REQUIRE offline activation:

  1. Government/Military - Classified systems, air-gapped networks
  2. Healthcare - HIPAA-compliant isolated networks
  3. Financial Services - Trading systems in secure facilities
  4. Industrial Control - SCADA systems, manufacturing floors
  5. Research Labs - Sensitive R&D environments
  6. Legal/Forensics - Evidence handling systems

Industry data:

  • 15-20% of enterprise customers have air-gapped requirements
  • Government contracts average 3-5x higher value than commercial
  • 89% of Fortune 500 companies have at least some air-gapped systems

If your licensing system can't work offline, you're excluding 15-20% of the most valuable market.

Offline Activation Methods

Quick License Manager supports multiple offline activation approaches:

1. QR Code Activation (Recommended)

2. Manual Activation

  • User copies Computer ID
  • Enters ID on self-service portal from another machine
  • Portal generates Computer Key
  • User copies key back to air-gapped system

3. Pre-Generated License Files

  • Generate license file in advance
  • Deliver via USB drive
  • Import into application
  • No internet needed at any point

Understanding the Offline Activation Flow 

AIR-GAPPED SYSTEM              ONLINE SYSTEM              LICENSE SERVER
     (No Internet)              (Has Internet)            (soraco.co)
         │                           │                         │
         │ 1. Generate Computer ID   │                         │
         │───────────────────────────▶                         │
         │                           │                         │
         │ 2. Show QR Code / Manual  │                         │
         │    Computer ID            │                         │
         │                           │                         │
         │                           │ 3. Submit Computer ID   │
         │                           │────────────────────────▶│
         │                           │                         │
         │                           │ 4. Generate Computer Key│
         │                           │◀────────────────────────│
         │                           │                         │
         │ 5. Return Computer Key    │                         │
         │◀───────────────────────────                         │
         │                           │                         │
         │ 6. Activate License       │                         │
         │    (Store Encrypted)      │                         │
         └───────────────────────────┘                         │
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Key insight: The Computer ID is generated offline and identifies the specific machine. The Computer Key is returned by the server and proves authorization.

Implementing Basic Offline Activation

Step 1: Generate Computer ID 

using QLM.LicenseLib;

public class OfflineActivationManager
{
    private LicenseValidator lv;
    private string settingsFile;

    public OfflineActivationManager(string settingsFilePath)
    {
        settingsFile = settingsFilePath;
        lv = new LicenseValidator(settingsFile);
    }

    public string GetComputerID()
    {
        // Generate unique identifier for this computer
        // Uses hardware identifiers configured in your QLM settings
        string computerID = lv.QlmLicenseObject.GetComputerID();

        // Example result: "ACME-PC-12AB34CD56EF"
        return computerID;
    }

    public string GetActivationKey()
    {
        // The activation key provided by the customer
        // Example: "AXYZ0-12345-ABCDE-67890-FGHIJ-KLMNO"
        return lv.ActivationKey;
    }
}
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The Computer ID is based on hardware binding and can use:

  • Computer Name
  • MAC Address
  • Motherboard Serial Number
  • CPU ID
  • Volume Serial Number
  • Active Directory Domain

Step 2: Display for Offline Activation 

public class OfflineActivationDialog : Form
{
    private TextBox txtActivationKey;
    private TextBox txtComputerID;
    private Button btnShowQRCode;
    private Button btnManualActivation;
    private OfflineActivationManager offlineManager;

    public OfflineActivationDialog()
    {
        InitializeComponent();
        offlineManager = new OfflineActivationManager("settings.xml");

        // Display Computer ID
        txtComputerID.Text = offlineManager.GetComputerID();
        txtComputerID.ReadOnly = true;
    }

    private void btnShowQRCode_Click(object sender, EventArgs e)
    {
        string activationKey = txtActivationKey.Text.Trim();

        if (string.IsNullOrEmpty(activationKey))
        {
            MessageBox.Show("Please enter your Activation Key first.");
            return;
        }

        // Generate QR code containing activation URL
        ShowQRCodeDialog(activationKey);
    }

    private void btnManualActivation_Click(object sender, EventArgs e)
    {
        // Show instructions for manual activation
        ShowManualActivationInstructions();
    }
}
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Step 3: Generate QR Code 

using QRCoder; // NuGet: QRCoder

public class QRCodeGenerator
{
    public Bitmap GenerateActivationQRCode(
        string activationKey, 
        string computerID, 
        string licenseServerUrl)
    {
        // Build activation URL
        string activationUrl = BuildActivationUrl(
            licenseServerUrl,
            activationKey,
            computerID
        );

        // Generate QR code
        var qrGenerator = new QRCodeGenerator();
        var qrCodeData = qrGenerator.CreateQrCode(
            activationUrl,
            QRCodeGenerator.ECCLevel.M // Medium error correction
        );

        var qrCode = new QRCode(qrCodeData);
        Bitmap qrCodeImage = qrCode.GetGraphic(
            pixelsPerModule: 20,
            darkColor: Color.Black,
            lightColor: Color.White,
            drawQuietZones: true
        );

        return qrCodeImage;
    }

    private string BuildActivationUrl(
        string serverUrl,
        string activationKey,
        string computerID)
    {
        // URL points to QLM Self-Service portal
        // Example: https://yoursite.com/qlmselfhelp/

        var uri = new UriBuilder(serverUrl);
        uri.Path += "QlmCustomerSite/qlmactivationqrcode.aspx";

        // Add query parameters
        var query = HttpUtility.ParseQueryString(uri.Query);
        query["qlmak"] = activationKey;
        query["qlmcid"] = computerID;
        uri.Query = query.ToString();

        return uri.ToString();
    }
}
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More details: Offline activation via QR code

Step 4: Display QR Code Dialog 

public class QRCodeActivationDialog : Form
{
    private PictureBox pictureBoxQR;
    private Label lblInstructions;
    private TextBox txtComputerKey;
    private Button btnActivate;

    public QRCodeActivationDialog(string activationKey, string computerID)
    {
        InitializeComponent();

        lblInstructions.Text = 
            "STEP 1: Scan this QR code with your smartphone\n" +
            "STEP 2: Your phone will open the activation page\n" +
            "STEP 3: The page will generate a Computer Key\n" +
            "STEP 4: Enter the Computer Key below";

        // Generate and display QR code
        var qrGenerator = new QRCodeGenerator();
        Bitmap qrImage = qrGenerator.GenerateActivationQRCode(
            activationKey,
            computerID,
            "https://yoursite.com/qlmselfhelp/"
        );

        pictureBoxQR.Image = qrImage;
        pictureBoxQR.SizeMode = PictureBoxSizeMode.Zoom;
    }

    private void btnActivate_Click(object sender, EventArgs e)
    {
        string computerKey = txtComputerKey.Text.Trim();

        if (string.IsNullOrEmpty(computerKey))
        {
            MessageBox.Show("Please enter the Computer Key from your phone.");
            return;
        }

        // Activate with the computer key
        bool success = ActivateOffline(computerKey);

        if (success)
        {
            MessageBox.Show(
                "License activated successfully!",
                "Activation Complete",
                MessageBoxButtons.OK,
                MessageBoxIcon.Information
            );
            this.DialogResult = DialogResult.OK;
            this.Close();
        }
    }

    private bool ActivateOffline(string computerKey)
    {
        try
        {
            var lv = new LicenseValidator("settings.xml");

            string response;
            bool success = lv.QlmLicenseObject.ActivateLicenseOffline(
                activationKey: lv.ActivationKey,
                computerKey: computerKey,
                response: out response
            );

            if (success)
            {
                // Store activated license
                lv.QlmLicenseObject.StoreKeys(computerKey);
                return true;
            }
            else
            {
                MessageBox.Show($"Activation failed: {response}");
                return false;
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show($"Error: {ex.Message}");
            return false;
        }
    }
}
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Manual Offline Activation

For users without smartphones or in extremely secure facilities:

Client-Side: Display Instructions 

public class ManualActivationDialog : Form
{
    private TextBox txtActivationKey;
    private TextBox txtComputerID;
    private Label lblInstructions;
    private TextBox txtComputerKey;
    private Button btnActivate;
    private Button btnCopyComputerID;

    public ManualActivationDialog()
    {
        InitializeComponent();

        var offlineManager = new OfflineActivationManager("settings.xml");
        txtComputerID.Text = offlineManager.GetComputerID();
        txtComputerID.ReadOnly = true;

        lblInstructions.Text = 
            "MANUAL ACTIVATION INSTRUCTIONS:\n\n" +
            "1. Copy the Computer ID below\n" +
            "2. On a computer with internet, visit:\n" +
            "   https://yoursite.com/qlmselfhelp/\n" +
            "3. Click 'Activate a License'\n" +
            "4. Enter your Activation Key and Computer ID\n" +
            "5. The website will display a Computer Key\n" +
            "6. Enter the Computer Key below and click Activate";
    }

    private void btnCopyComputerID_Click(object sender, EventArgs e)
    {
        Clipboard.SetText(txtComputerID.Text);
        MessageBox.Show(
            "Computer ID copied to clipboard!\n\n" +
            "Paste it on the activation website.",
            "Copied",
            MessageBoxButtons.OK,
            MessageBoxIcon.Information
        );
    }

    private void btnActivate_Click(object sender, EventArgs e)
    {
        string computerKey = txtComputerKey.Text.Trim();

        if (string.IsNullOrEmpty(computerKey))
        {
            MessageBox.Show("Please enter the Computer Key from the website.");
            return;
        }

        // Same activation logic as QR code method
        bool success = ActivateOffline(computerKey);

        if (success)
        {
            MessageBox.Show("License activated successfully!");
            this.DialogResult = DialogResult.OK;
            this.Close();
        }
    }
}
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Server-Side: Self-Service Portal

QLM provides a self-service portal that you can customize and host on your website:

<!-- Embed in your website -->
<iframe src="https://yoursite.com/qlmselfhelp/QlmCustomerSite/qlmactivation.aspx"
        width="600" 
        height="800" 
        frameborder="0">
</iframe>
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The portal automatically:

  • Validates the Activation Key
  • Verifies the Computer ID
  • Generates a secure Computer Key
  • Displays the key to the user
  • Records the activation in your database

Using the QLM License Wizard

The easiest approach: use QLM's built-in License Wizard:

Launch the Wizard 

public class LicenseWizardLauncher
{
    public void ShowActivationWizard()
    {
        // Path to QLM License Wizard
        string wizardPath = Path.Combine(
            Application.StartupPath,
            "QlmLicenseWizard.exe"
        );

        // Launch with offline activation enabled
        var startInfo = new ProcessStartInfo
        {
            FileName = wizardPath,
            Arguments = BuildWizardArguments(),
            UseShellExecute = false
        };

        Process.Start(startInfo);
    }

    private string BuildWizardArguments()
    {
        var args = new StringBuilder();

        // Settings file
        args.Append($"/settings \"{settingsFilePath}\" ");

        // Enable offline activation
        args.Append("/offline ");

        // Show QR code option
        args.Append("/qrcode ");

        // Product information
        args.Append("/productname \"My Application\" ");
        args.Append("/productversion \"1.0\" ");

        return args.ToString();
    }
}
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The QLM License Wizard automatically:

  • Detects if system is offline
  • Offers QR code or manual activation
  • Generates Computer ID
  • Displays QR code for smartphone scanning
  • Accepts Computer Key input
  • Completes activation

No UI code needed on your part!

Offline Deactivation

Just as important: letting users deactivate licenses offline:

Generate Deactivation Verification Code 

public class OfflineDeactivationManager
{
    private LicenseValidator lv;

    public string GenerateDeactivationVerificationCode()
    {
        // Get the currently activated license
        string activationKey = lv.ActivationKey;
        string computerID = lv.QlmLicenseObject.GetComputerID();

        // Generate verification code
        string dvc = lv.QlmLicenseObject.GenerateDeactivationVerificationCode(
            activationKey,
            computerID
        );

        // Example: "DVC-12AB-34CD-56EF"
        return dvc;
    }

    public void ShowOfflineDeactivationDialog()
    {
        string dvc = GenerateDeactivationVerificationCode();

        MessageBox.Show(
            $"OFFLINE DEACTIVATION INSTRUCTIONS:\n\n" +
            $"1. Deactivation Verification Code: {dvc}\n" +
            $"2. On a computer with internet, visit:\n" +
            $"   https://yoursite.com/qlmselfhelp/\n" +
            $"3. Click 'Deactivate a License'\n" +
            $"4. Enter your Activation Key and the DVC\n" +
            $"5. The license will be released on the server\n\n" +
            $"This computer's license will be removed when you click OK.",
            "Offline Deactivation",
            MessageBoxButtons.OKCancel,
            MessageBoxIcon.Information
        );
    }
}
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More on offline deactivation with verification codes.

Deactivation with QR Code 

public Bitmap GenerateDeactivationQRCode(
    string activationKey,
    string computerID)
{
    // Generate DVC
    string dvc = lv.QlmLicenseObject.GenerateDeactivationVerificationCode(
        activationKey,
        computerID
    );

    // Build deactivation URL
    string deactivationUrl = BuildDeactivationUrl(
        "https://yoursite.com/qlmselfhelp/",
        activationKey,
        computerID,
        dvc
    );

    // Generate QR code
    var qrGenerator = new QRCodeGenerator();
    var qrCodeData = qrGenerator.CreateQrCode(
        deactivationUrl,
        QRCodeGenerator.ECCLevel.M
    );

    var qrCode = new QRCode(qrCodeData);
    return qrCode.GetGraphic(20);
}

private string BuildDeactivationUrl(
    string serverUrl,
    string activationKey,
    string computerID,
    string dvc)
{
    var uri = new UriBuilder(serverUrl);
    uri.Path += "QlmCustomerSite/qlmdeactivationqrcode.aspx";

    var query = HttpUtility.ParseQueryString(uri.Query);
    query["qlmak"] = activationKey;
    query["qlmcid"] = computerID;
    query["qlmdvc"] = dvc;
    uri.Query = query.ToString();

    return uri.ToString();
}
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QR code deactivation workflow:

  1. User clicks "Deactivate License"
  2. App generates deactivation QR code
  3. User scans with smartphone
  4. Phone opens deactivation portal
  5. Portal releases license on server
  6. User confirms deactivation in app

Pre-Generated License Files

For maximum security or pre-deployment scenarios:

Server-Side: Generate License File 

public class LicenseFileGenerator
{
    public byte[] GenerateLicenseFile(
        string activationKey,
        string computerID,
        string customerEmail)
    {
        var lv = new LicenseValidator("settings.xml");

        // Activate the license server-side
        string response;
        bool success = lv.QlmLicenseObject.ActivateLicense(
            webServiceUrl: lv.QlmLicenseObject.DefaultWebServiceUrl,
            activationKey: activationKey,
            computerID: computerID,
            computerName: "PreGenerated",
            qlmVersion: lv.QlmLicenseObject.QlmVersion,
            userData: customerEmail,
            response: out response
        );

        if (!success)
        {
            throw new Exception($"Activation failed: {response}");
        }

        // Extract license file content from response
        // Response contains XML with license data
        string licenseXml = ExtractLicenseFromResponse(response);

        // Encrypt and package
        byte[] encryptedLicense = EncryptLicenseFile(licenseXml);

        return encryptedLicense;
    }

    private string ExtractLicenseFromResponse(string response)
    {
        // Parse the response XML
        var doc = new XmlDocument();
        doc.LoadXml(response);

        // Extract license node
        var licenseNode = doc.SelectSingleNode("//LicenseFile");
        return licenseNode?.InnerXml ?? string.Empty;
    }
}
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Client-Side: Import License File 

public class LicenseFileImporter
{
    public bool ImportLicenseFile(string licenseFilePath)
    {
        try
        {
            // Read license file
            byte[] encryptedLicense = File.ReadAllBytes(licenseFilePath);

            // Decrypt
            string licenseXml = DecryptLicenseFile(encryptedLicense);

            // Store in QLM's license location
            var lv = new LicenseValidator("settings.xml");
            lv.QlmLicenseObject.StoreKeys(licenseXml);

            // Validate
            bool needsActivation = false;
            string errorMsg = string.Empty;

            bool isValid = lv.ValidateLicenseAtStartup(
                ELicenseBinding.ComputerName,
                ref needsActivation,
                ref errorMsg
            );

            if (isValid)
            {
                MessageBox.Show(
                    "License file imported successfully!",
                    "Success",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Information
                );
                return true;
            }
            else
            {
                MessageBox.Show($"License validation failed: {errorMsg}");
                return false;
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show($"Import failed: {ex.Message}");
            return false;
        }
    }
}
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Deployment workflow:

  1. Generate license files for all target computers
  2. Package files on USB drive
  3. Deliver to customer site
  4. Install software + import license files
  5. No internet needed at any point

Security Considerations

1. Validate Computer Key Integrity 

public bool ValidateComputerKey(string computerKey)
{
    // QLM Computer Keys contain:
    // - Digital signature
    // - Timestamp
    // - Computer ID hash
    // - Activation Key reference

    // Validation is built into ActivateLicenseOffline
    // But you can add extra checks:

    if (string.IsNullOrEmpty(computerKey))
        return false;

    // Check format (QLM uses specific patterns)
    if (!Regex.IsMatch(computerKey, @"^[A-Z0-9\-]+$"))
        return false;

    // Check minimum length
    if (computerKey.Length < 50)
        return false;

    return true;
}
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2. Prevent Computer ID Tampering 

public class SecureComputerIDGenerator
{
    public string GetSecureComputerID()
    {
        // Use multiple hardware identifiers
        var lv = new LicenseValidator("settings.xml");

        // Configure in QLM to use:
        // - Motherboard Serial (hardest to spoof)
        // - CPU ID (processor-specific)
        // - Volume Serial (hard drive)

        string computerID = lv.QlmLicenseObject.GetComputerID();

        // Add application-specific salt
        string salted = HashWithSalt(computerID);

        return salted;
    }

    private string HashWithSalt(string input)
    {
        // Add your application-specific salt
        string salt = "YourApp-V1.0-2024";
        return SHA256Hash(input + salt);
    }
}
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3. Time-Limited Offline Periods 

public class OfflineTimeManager
{
    private const int MaxOfflineDays = 30;

    public bool IsOfflinePeriodValid()
    {
        var lv = new LicenseValidator("settings.xml");

        // Get last server contact
        DateTime lastContact = lv.QlmLicenseObject.LastAccessedDate;

        // Calculate days offline
        int daysOffline = (DateTime.Now - lastContact).Days;

        if (daysOffline > MaxOfflineDays)
        {
            ShowReactivationRequired();
            return false;
        }

        return true;
    }

    private void ShowReactivationRequired()
    {
        MessageBox.Show(
            $"This license has been offline for more than {MaxOfflineDays} days.\n\n" +
            "Please connect to the internet and reactivate your license,\n" +
            "or perform an offline reactivation.",
            "Reactivation Required",
            MessageBoxButtons.OK,
            MessageBoxIcon.Warning
        );
    }
}
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Best Practices

1. Provide Multiple Activation Methods 

public class ActivationMethodSelector : Form
{
    private Button btnOnlineActivation;
    private Button btnQRCodeActivation;
    private Button btnManualActivation;
    private Button btnLicenseFile;

    private void DetectConnectivity()
    {
        bool hasInternet = CheckInternetConnection();

        if (hasInternet)
        {
            // Online is fastest - make it primary
            btnOnlineActivation.Enabled = true;
            btnOnlineActivation.BackColor = Color.FromArgb(0, 122, 204);

            // Others available as fallback
            btnQRCodeActivation.Enabled = true;
            btnManualActivation.Enabled = true;
        }
        else
        {
            // Offline mode - disable online
            btnOnlineActivation.Enabled = false;

            // Emphasize offline methods
            btnQRCodeActivation.BackColor = Color.FromArgb(0, 122, 204);
            btnManualActivation.Enabled = true;
        }

        // License file always available
        btnLicenseFile.Enabled = true;
    }
}
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2. Clear User Instructions 

public class ActivationInstructionsDialog : Form
{
    public void ShowInstructions(ActivationMethod method)
    {
        string instructions = method switch
        {
            ActivationMethod.QRCode => 
                "QR CODE ACTIVATION:\n\n" +
                "1. Your smartphone must have internet access\n" +
                "2. Scan the QR code that will be displayed\n" +
                "3. Your phone's browser will open automatically\n" +
                "4. A Computer Key will be displayed\n" +
                "5. Enter that key in the next screen\n\n" +
                "This process takes about 2 minutes.",

            ActivationMethod.Manual =>
                "MANUAL ACTIVATION:\n\n" +
                "1. You'll need access to a computer with internet\n" +
                "2. Copy the Computer ID we'll show you\n" +
                "3. Visit our activation website\n" +
                "4. Enter your Activation Key and Computer ID\n" +
                "5. Copy the generated Computer Key\n" +
                "6. Return here and enter that Computer Key\n\n" +
                "This process takes about 5 minutes.",

            ActivationMethod.LicenseFile =>
                "LICENSE FILE IMPORT:\n\n" +
                "1. You should have received a .lic file\n" +
                "2. Copy it to a USB drive if needed\n" +
                "3. We'll prompt you to select the file\n" +
                "4. Activation will be immediate\n\n" +
                "This process takes about 1 minute.",

            _ => "Unknown activation method"
        };

        MessageBox.Show(instructions, "Activation Instructions");
    }
}
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3. Test Offline Scenarios 

[TestClass]
public class OfflineActivationTests
{
    [TestMethod]
    public void TestQRCodeGeneration()
    {
        var qrGenerator = new QRCodeGenerator();
        var bitmap = qrGenerator.GenerateActivationQRCode(
            "TEST-KEY-12345",
            "COMPUTER-ID-67890",
            "https://test.soraco.co/qlmselfhelp/"
        );

        Assert.IsNotNull(bitmap);
        Assert.IsTrue(bitmap.Width > 0);
    }

    [TestMethod]
    public void TestOfflineActivation()
    {
        var lv = new LicenseValidator("test-settings.xml");

        // Simulate offline activation
        string computerKey = "GENERATED-COMPUTER-KEY";
        string response;

        bool success = lv.QlmLicenseObject.ActivateLicenseOffline(
            "TEST-KEY",
            computerKey,
            out response
        );

        Assert.IsTrue(success);
    }

    [TestMethod]
    public void TestLicenseFileImport()
    {
        var importer = new LicenseFileImporter();
        bool success = importer.ImportLicenseFile("test-license.lic");

        Assert.IsTrue(success);
    }
}
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Using Quick License Manager

While you can implement offline activation from scratch, Quick License Manager provides:

✅ QR code activation built-in

✅ Self-service portal ready to deploy

✅ QLM License Wizard with offline support

✅ Offline deactivation with verification codes

✅ Pre-generated license files

✅ Hardware binding with multiple identifiers

✅ Cross-platform support (Windows, Linux, Mac, mobile)

Download QLM and test offline activation in your environment.

Conclusion

Offline activation isn't optional for enterprise software—it's a requirement for accessing the most valuable markets. The three approaches each serve different needs:

QR Code Activation:

  • Fastest and most user-friendly
  • Requires smartphone with internet
  • 2-minute activation process

Manual Activation:

  • Works in maximum security environments
  • Requires access to any internet-connected device
  • 5-minute activation process

Pre-Generated License Files:

  • Perfect for pre-deployment
  • Zero internet requirements
  • Instant activation

Supporting offline activation opens doors to government contracts, healthcare deployments, financial institutions, and industrial control systems—markets that command 3-5x higher prices than standard commercial software.

With Quick License Manager, offline activation is built-in with QR codes, self-service portals, and comprehensive documentation. Don't let online-only licensing cost you your most valuable deals.

Resources

Have you implemented offline activation? What challenges did you face? Share in the comments! 💬

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