ios appstore – App store requires documents to distribute content

I publish my app on the App Store but it has not been accepted for several times and the reviewer requests that the document be allowed to broadcast the content.
but I do not know how to document?

the criticism of the App Store Answer:

Thank you for your message. Please reply with the attached documentation, using the download feature, proving that Jenyar has been authorized to distribute the content owned by the artists. Once Legal has reviewed your documentation and confirmed its validity, we will review your request.

please if someone knows about this guide me
Thank you