So which Rav said its permissable to take a recently published book, that is still being sold in the bookstore, and make copies and sell them yourself? Or a new CD that is still on sale?
There’s a question of “fair use” whenever your copying doesn’t deprive the owner of his income, or perhaps for personal use under certain conditions – put going into business against the creator of the work by making and distributing copies so people won’t have to pay for it? Who says that’s allowed (Purim “torah” excluded).