Copyright for classes

In the Copyright Q&A session at conference, one topic that we discussed was that of using materials for classes, over a period of time. This might involve multiple copies for classroom use or course reserves (paper or electronic). We discussed how the traditional interpretation of this practice was that it was fine for a single class, but not allowable over time, that is, each semester or even each year. Now, I've just read a discussion on the Copyright Advisory Network (CAN) forum which seems to imply that our interpretation may have been too restrictive. It might be valuable for academic and school librarians to take a look at this discussion. And, if you have something more to add or ask, I encourage anyone who's interested to register (it's quick and easy - more to discourage spam than anything else) and comment. While you're at it, check out some of the other resources at the site, and please let me know if you have any suggestions for improvement (either email me or mention it in the comments to this post).