Tight Restrictions on Al use of Copyrighted Material (Serious Post)

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Two weeks ago, i was able to create a study guide with Claude that used the entirety of an article on the web and citation texts also derived from copyrighted material. Today Claude refuses to include any copyrighted material in the study guide ar all. I am surprised because at least the citation references are just a few sentences each. What happened to fair use? This has completely disabled my ability to use AI for this use case. What am I missing here?