Not a 'good receipt and discharge' in this non-conveyancing context.

Unless an oepratic library book, there are no IP - intellectual property rights - being 'loaned' or 'lent', though it's possible for a work or art to be 'loaned' physically to an art gallery or museum on condition of return in due course -> not always a foregone conclusion in cases I have been in on.

autorizzazione a titolo gratuito dei diritti di riproduzione : gratuitous aka in Eng. law 'voluntary' -> authoris/zing : for no good -> natural family love + affection or valuable consideration - of repro rights / surely liberatoria refers forward to 'these' latter rights.

Copyright is transferred in English law - by legal -> ITA formal or equitable -> ITA informal assignment or by being 'licensed' vs. loaned e.g. on hire purchase aka the Never-Never. A franchise - that used to be mean in UK the right to vote - might, in a business rather than an art loan context, include a coypright assignment or licenc/se.

I'm unsure a 'coypright agreement' - that is wide and elastic enough to encompass a copright acknowledgement-only - gets and puts over the 'liberatoria' aspect, but I l'll leave it to the foregoing commentators to post such idea.