Royalty free doesn't mean you can use it any way you like. You need to read the fine print. If something is being used for promotion, which means you hope to gain financially from it, the "royalty free" license may change for you. Sometimes people require credit, sometimes they stipulate that you can't use it for that purpose. You need to read the fine print! Yes, I'm going to say that a lot.
After 8 years of creating book trailers and over 600 book trailers created, I've seen a lot of… Continue