Copyright! Ah!

So, as it turns out, there is a lot about copyright laws that I didn't know. Here are some of the things I found most interesting, and unreasonable:
*Teachers are not allowed to show their own movies in class because it violates copyright laws
*Teachers are not allowed to buy songs from iTunes and play them in their class because it
violates copyright laws
*You cannot play music and have a fund raiser because you are making money and it violates copyright laws
These are just a few of things that were surprising to me. It's not as though I'm necessarily worried about getting in trouble with the "copyright police", but it does make me think twice about plans I had as a teacher. While I know that this is good knowledge to have, especially as a teacher being set to higher standards than others, but I can't say that I won't continue to violate those laws. I feel as though its inevitable, and I'm not willing to sacrifice my students education by redesigning lessons because I'm worried about breaking copyright laws.