How to protect a .NET Core app with QLM

Note that QLM support for .NET Core is currently in Beta. It will be officially released in Sept 2019 when .NET Core 3 will be released.

Please contact us to request access to the Beta release.

To protect a .NET Core app with QLM:

  • Download the QLM .NET Core library (QlmLicenseLibNetCore.dll)

  • In your .NET Core project:

    • Add a reference to QlmLicenseLibNetCore.dll

    • Add the following nuget packages:

      • System.Private.ServiceModel

      • System.Security.Cryptography.Xml

      • System.ServiceModel.Http

  • From the QLM Management Console, generate a LicenseValidator class (C#)

  • Add the LicenseValidator class your .NET Core project

  • When your application is loaded, call the LicenseValidator.ValidateLicenseAtStartup function as shown in the code below (this is similar to a regular .NET 4.x project)

ELicenseBinding licenseBinding = ELicenseBinding.ComputerName;

if (lv.ValidateLicenseAtStartup(licenseBinding, ref needsActivation, ref errorMsg) == false)

    if (lv.ValidateLicenseAtStartup(licenseBinding, ref needsActivation, ref errorMsg) == false)

private int DisplayLicenseForm()
    string errorMessage;
    if (lv.QlmLicenseObject.ValidateSettingsFile(settingsFile, out errorMessage) == false)
        MessageBox.Show(this, errorMessage, "QLM", MessageBoxButtons.OK, MessageBoxIcon.Error);
        return 0;

    string args = String.Format("/settings \"{0}\"", settingsFile);

    int ret = lv.QlmLicenseObject.LaunchProcess(wizardExe, args, true, true);

    return ret;

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