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Audible unveils plans to use AI voices to narrate audiobooks
(www.theguardian.com)
This is a most excellent place for technology news and articles.
In this case the AI voices are reading the exact copyrighted material so the original author or rights holder must be contacted to secure the necessary rights and licensing agreements. There is no free use argument.
Now, if the voices have been trained on copy protected sources to create a likenesses (e.g. Scarlet Johansson) then there could be a lawsuit.