This tool helps you to generate the Entitlement Message JSON section by section, as documented here.
Additionally, you can transform your entitlement message into a license service message and sign it as a JWT to use it as a license token in your player.
Entitlement message JSON sections builder
Content Keys Source
Encrypted Key calculation helper
Content Key Usage Policies
Generated Entitlement Message JSON
Wrap the Entitlement Message into an Axinom DRM License Service Message.
Generate a license token