Selling my flash cards -- any issues?
I was thinking about selling my stack of homemade flash cards from Network+. There are something like 700 of them, all written by me for studying. Are there any reasons why I shouldn't/couldn't do this from a legal standpoint? It might seem like weird question, but I wondered because I read two books in order to create them. Even though I created them, I wondered if I would be stepping on the author's toes?