This is the single clause that decides whether a trained identity is an asset or a liability. A grant to "use the images" does not imply a right to build a model that produces images the person never sat for.
A usable clause names the act explicitly, using words like train or fine-tune; states what the generated likeness may be used to say and sell; sets territory and duration with a real end date; lists excluded categories; and says what happens to the trained artefact when the term ends.
Performers ask for the exclusions and they are right to. Political content, adult content, and claims about health, finance or legal matters are the standard carve-outs, and refusing them is a bad look and a worse negotiation.
What makes a release cover AI training?
It has to name the act. If the words train, fine-tune or an equivalent do not appear, the permission has not been given, however broad the general grant looks.
What happens to a trained model at the end of the term?
Whatever the agreement says, which is why it has to say something. Deleted, escrowed or retained are all defensible; silence is not.