Using LexActivator

Licensing your app with node-locked or floating licenses can be done using LexActivator.

Adding licensing to your app

First of all, login to your Cryptlex account and download the LexActivator library for Windows, macOS or Linux:

The above download package contains the library (shared as well as static) which you will be using to add licensing to your app.

After you've added a product for your app in the admin portal, you will need to do the following things:

  • Note the Product ID for the product.
  • Download the Product.dat file for your product from the actions menu on the Products page.
  • Download the example project from GitHub.

Product.dat contains product data that is used by LexActivator. The product id is the identifier of your product that is to be used in the code.

Adding the library to your app

First of all, login to your Cryptlex account and download the LexActivator library for Windows, macOS or Linux:

The above download package contains the library (shared as well as static) which you will be using to add licensing to your app.

After you've added a product for your app in the admin portal, you will need to do the following things:

  • Note the Product ID for the product.
  • Download the Product.dat file for your product from the actions menu on the Products page.
  • Download the example project from Github.

Setting product.dat file and product id

The first thing you need to do is either embed the Product.dat file in your app using SetProductData() function or set the absolute path of the file using SetProductFile() function.

The next thing you need to do is to set the product id of your application in your code using SetProductId() function. It sets the id of the product you will be adding licensing to.

The first thing you need to do is either embed the Product.dat file in your app using SetProductData() function or set the absolute path of the file using SetProductFile() function.

The next thing you need to do is to set the product id of your application in your code using SetProductId() function. It sets the id of the product you will be adding licensing to.


SetProductData("PASTE_CONTENT_OF_PRODUCT.DAT_FILE");
SetProductId("PASTE_PRODUCT_ID", LA_USER);

If your app requires admin (root) privileges to run (e.g. services, daemons etc.), instead of passing LA_USER flag, you need to pass LA_SYSTEM flag.

If your app requires a single activation to be shared across all OS users (system-wide activation), pass the LA_ALL_USERS flag before activation. This flag is compatible with Windows OS only.

License Activation

To activate the license in your app using the license key, you will use ActivateLicense() LexActivator API function. It invokes the /v3/activations Cryptlex Web API endpoint, verifies the encrypted and digitally signed response to validate the license.


int status;
status = SetProductData("PASTE_CONTENT_OF_PRODUCT.DAT_FILE");
if (LA_OK != status)
{
// handle error
}
status = SetProductId("PASTE_PRODUCT_ID", LA_USER);
if (LA_OK != status)
{
// handle error
}
status = SetLicenseKey("PASTE_LICENCE_KEY");
if (LA_OK != status)
{
 // handle error
}
status = SetActivationMetadata("key1", "value1");
if (LA_OK != status)
{
 // handle error
}
status = ActivateLicense();
if (LA_OK == status || LA_EXPIRED == status || LA_SUSPENDED == status)
{
printf("License activated successfully: %d", status);
}
else
{
printf("License activation failed: %d", status);
}

The above code should be executed at the time of license activation, ideally on a button click.

Verifying license activation

Each time, your app starts, you need to verify whether your license is already activated or not. This verification should occur locally by verifying the cryptographic digital signature of activation. Ideally, it should also asynchronously contact Cryptlex servers to validate and sync the license activation periodically. For this you need to use IsLicenseGenuine() LexActivator API function.


int status;
status = SetProductData("PASTE_CONTENT_OF_PRODUCT.DAT_FILE");
if (LA_OK != status)
{
  // handle error
}
status = SetProductId("PASTE_PRODUCT_ID", LA_USER);
if (LA_OK != status)
{
  // handle error
}
status = IsLicenseGenuine();
if (LA_OK == status || LA_EXPIRED == status || LA_SUSPENDED == status  || LA_GRACE_PERIOD_OVER == status)
{
  printf("License is genuinely activated: %d", status);
}
else
{
  printf("License is not activated: %d", status);
}

The above code should be executed every time user starts the app. After verifying locally, it schedules a periodic server check in a separate thread.

Need more help?

In case you need more help with adding LexActivator to your app, we'll be glad to help you make the integration. You can either post your questions on our support forum or can contact us through email.

OverviewUsing Web API
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