On the topic of copyright, I just happened across some Dover
Electronic Clip art books and CD Roms. They have many master works pdfs
that you can download and use without special permission provided you
don't use more than 10 in a project. This is a great resource for
teaching.
120 Great American Paintings DVD and Book Dover Platinum
120 Impressionists Painting CD-ROM and Book Dover
120 Great Paintings CD-ROM and Book Dover
You can get them through Amazon if you are interested.
Cheri Lloyd
Art Teacher/ Beginning Teacher Mentor
Whitmore Charter School of the Arts and Technology