As I can understand about privacy manifest for Apple, if I don’t have PrivacyInfo in my third-party library, I can create PrivacyInfo myself in my app project and add the details for a third-party library.

But my question is, My third-party library is too old and did not provide updates(privacy manifest and signature). And if I add details of that library into my app’s privacy manifest. But how I can create a signature for that third-party library or what should I have to do for that?

Need more clarification for the old third-party library which could not provide a privacy manifest and signature. Then how can proceed without that old library’s signature?