The short answer, is that if you don't have the rights to use the music, then it is usually a violation of someone's rights for you to use it. When you buy it off iTunes, you are only getting limited rights defined by your agreement with iTunes. Anything outside the bounds of that agreement is probably not authorized and you can possibly get into trouble for it. From your question, it sounds like this comes up for you in a lot of situations. You might want to go research the law so you can get a good foundation on how it all works. Search the internet for "fair use" and "copyright rights" and that should get you a good start.
Answered on May 10th, 2013 at 10:54 AM