Quote:
Originally Posted by ilovejedd
I believe for artwork and the like, "Creative Commons" is usually the license used for freely distributable content. ...
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True, but "freely distributable" doesn't mean that they can be altered. Using them for a book cover would be altering the image. Only when the CC work doesn't restrict changes and alterations (the No Derivatives flag) should you use it as a component in a cover. Also, CC works often require that give the creator credit for the work (the Attribution flag in the CC license).