This article was of special intrest to me.  I had no idea of the following concept presented: The law holds that as soon as you create these works and fix them into a permanent medium, you own the copyright on them. That's right; you don't need to include the symbol © or the word "copyright" in the document. Your work is automatically protected by copyright. The law also holds that the copyright of work produced while under employment belongs to the employer.  I was under the impression that all copyrights must be applied for.
I will also be very careful in reproducing authors' works for students use in the classroom.  In the past, I may not have followed the  guidelines for proper use of copyrighted materials.  Thanks for the article.