This is a pretty good web-based audio editor. This could serve as a good replacement for Audacity or GarageBand. It has some great effects and a good library of sound clips. It operates in much the same way as Audacity of GarageBand, just in your web browser.
Some Chinese school officials have gone against the wishes of the national government and removed Internet filtering software becuase it "has strong conflicts with teaching software we need for normal work." On the other hand, many public schools in the US not only tolerate draconian filtering policies, but elect to implement such policies on the local level!
Why are we willing to sacrifice educational opportunities for some imagined sense of security about our children?
If you haven't looked over the "Unmasking the Digital Truth" Wiki, I highly recommend that you do so. It discusses some of the common misconceptions about Internet filtering in schools and associated laws. (http://unmaskdigitaltruth.pbworks.com/)
Article about how some schools in China have uninstalled the controversial Internet filter (Green Dam), which was required to be installed on all public systems by mandate of the Chinese government.
This is a site created by Northern Kentucky University. It contains lesson plans and videos for teachers to use to teach about plagiarism, copyright, and fair use. Target audience is middle school and high school classrooms.
(Hosted by the California Student Media Festival) This page displays a chart that shows how and under what conditions one can use media without violating copyright. The chart specifies its sources. Perhaps the chart could be re-made to make it more readable.