Copyright shock

I was very surprised about what is actually in the copyright guidelines that we learned about.  I did not realize how strict the guidelines are.  I had no idea that only 10% or 30 seconds of a song could be used or 10% from a text or only 5 images from a single author.  I also was surprised to that there is a two year time limit for teacher to get permission for the copyrighted material they use.  What was most shocking was that almost every teacher I had in elementary and secondary school had broken these guidelines.  I remember teachers copying packets out of workbooks and pages out of textbooks when we did not have the original copies available.  This will affect me in the classroom by making more aware of what I can use in my teaching material.  I do not really understand why only 30 seconds of a song can be used in a presentation.  If I played 2 minutes of a song, it is not like this will prevent students from still purchasing it on ITunes. I am not making money off this song either.  I am glad to learn about this because I would have broken a lot of these guidelines without even knowing about it.  I will save the PowerPoint presentation on the copyright guidelines to refer to for student teaching next semester.