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Creative Commons Licenses offer an alternative to the "All Rights Reserved" model of intellectual property that is created by default when a work is expressed (and thus falls under copyright law). The copyright holder can choose to publish their materials under Creative Commons licensing to increase its usage (and some would argue that this increases its value), to allow for collaboration with other content creators, and/or to meet aspirational goals of contributing to the "greater good" of society. It provides the licensing basis for "open educational resources", including "open access journals".
Explanation of the CreativeCommons license elements
Creative Commons helps you share your knowledge and creativity with the world.Creative Commons develops, supports, and stewards legal and technical infrastructure that maximizes digital creativity, sharing, and innovation.
Flickr Commons is a collaborative project that allows cultural heritage organizations, such as the Library of Congress, the Smithsonian, and several dozen other museums and archives, to make their materials more easily discovered. Through the Flickr Commons, those organizations get direct feedback from the public about their materials, as well. All images are published with "no known copyright" restrictions and are part of the public domain.
Contains free high resolution digital stock photographs and reference images for either corporate or public use. The site's purpose is to provide free image reference material for illustrators, comic book artist, designers, teachers and all creative pursuits. The current license allows for use and remixing without attribution, but prohibits you from selling the images or claiming ownership.