"AVS Unit Attestation (AVSUA): A data object, issued by the provider of an Age Verification solution, that describes an Age Verification App Instance and the device on which it is installed, enabling an Attestation Provider to verify that the App Instance is a genuine and untampered instance of a compliant Age Verification solution."
https://docs.ageverification.dev/av-doc-technical-specification/docs/architecture-and-technical-specifications/
You will not be allowed to modify the app. This is obviously incompatible with the core principles of open-source software.