They're not reproducing the work, they're merely writing about it. Copyright law does not prohibit one from writing at length about another book. Rather, it prohibits the complete reproduction (copying) of that work.How does something like Cliff Notes fall under fair use?
It has nothing to do with profiting from your summary of someone else's work.
Yup. And then you hold the copyright for that work.Are you allowed to write about a subject that may be copyrighted, if what you write is original content?

