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Creative Commons License

Creative Commons makes use of four different license
conditions—attributionconditions - attribution, share-alike, noncommercial, and no derivative
works—in works - in varying combinations to create six distinct, and free, usage
licenses. Several million pages of web content are currently governed
by Creative Commons licenses.

The attribution tag permits others to copy, distribute, display, and
perform your copyrighted work — - and the derivative works based upon it
— - but only if they provide you with the credit you request.

"Share-alike" permits others to distribute derivative works but only
under a license identical to the license that governs your work. The
non-commercial tag lets others copy, distribute, display, and perform
your work — - and derivative works based upon it — - but for noncommercial
purposes only.

And "no derivitive works" lets others copy, distribute,
display, and perform only verbatim copies of your work, not derivative
works based upon it.  

Creative Commons: Guilt-Free Use of Other's Work

Read blog entry by Princeton staff.