Proof of the rights provided for in article L. 135-6 is submitted by registered letter with acknowledgement of receipt or by electronic means with acknowledgement of receipt.
In support of his or her request, the author must produce a copy of an identity document and a declaration on his or her honour attesting to his or her status. Any successors in title must also provide a deed of notoriety attesting to their status. In addition to a copy of an identity document, the other right holders produce any document likely to justify their rights.