When we wrote this book chapter on copyright issues related to generative AI in 2018, I couldn't imagine how timely it would become in a couple of years:
"AI-generated content: authorship and inventorship in the age of artificial intelligence", Rosa Maria Ballardini, Kan He, and Teemu Roos
Published version (paywalled): https://www.elgaronline.com/display/edcoll/9781788119894/9781788119894.00015.xml
Author's version (free pdf): https://www.cs.helsinki.fi/u/ttonteri/pub/aicontent2018.pdf