AI companies like OpenAI are facing pressure from copyright disputes, with The New York Times suing OpenAI for infringement. It is very difficult to remove specific training data from the models, and researchers are exploring a 'forgetting spell.' Researchers have made some progress in testing the forgetting spell using texts, including Harry Potter. The rich language and narrative of Harry Potter are appreciated by AI researchers. Harry Potter appears in the theories of some AI ideologies, such as effective altruism.