This week, I found this article hugely helpful regarding copyright.  

Playing with a creative commons search, I noticed that you don't get nearly as many files, and the files that you do get are different from, the files with a standard google image search, which I guess is the reason that people prefer to ignore copyright issues and just make it easy (though illegal).

Here is the search from Creative Commons website and then using the Google Image filter for "multimedia education":

VERSUS

Here is the search from Google Image for "multimedia education"

This infographic explaining creative commons use is fantastic!

This site has a great list of where to find images and how to appropriately search them to get images that are licensed the way you want them. 

On the one hand, there is this part of me that says, "Who Cares?" It's for educational purposes, but then I hear another voice in my head saying, "Well then, why would you make your students write a bibliography?  Isn't their writing still for educational purposes?"

This was entirely new to me regarding the use of audio files:  "Like images, it is most likely you will either be using audio that is connected to a specific learning objective or it will be “background noise.” If the latter, be sure that you have found something that is licensed for reuse. "  Also, I was amused by "Don't assume everybody uses iTunes?"  Seriously?! Doesn't everybody?!   :P  It is interesting that then we must consider accessibility issues when considering using audio files; we don't think hard on this one with visual files, but aren't there just as many students with visual problems as auditory problems?  What would you say if a student "can't view your presentation adequately"?  After the time spent developing such a presentation, it would be rough to have to find another way to communicate that information.  Accessibility is always a challenging task.  

It took me a REALLY long time to find a shareable Beethoven's ninth symphony that I could use for "A Clockwork Orange."  I mean a REALLY long time.  Again, I can understand the temptation to just go to youtube and not worry about how the content is licensed because it would have saved me about 40 minutes.  Also, some of the free music is great Indie stuff for casual listening, but not necessarily educational.