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SAG-AFTRA reveals terms of ‘groundbreaking’ deal
(www.cnn.com)
This is a most excellent place for technology news and articles.
It's likely that background actors will get a boilerplate contract stating their likeness can be ai generated for other projects and current project for the use of background. Don't sign it, you don't get to do it.
Everyone else should be fairly good and protected from ai issues. At least until enough starving actors are willing to sign away their rights for a chance at a better casting in hopes of "making it big"