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publication, but allow the author to specify terms regarding the redistribu-
tion and use of a work. Creative Commons licenses are appropriate for
documents, images, and certain other resources where the author of the
resource is the copyright holder and the terms of use are both simple and
unchanging. The Creative Commons license family provides licensing on
four separate dimensions to form six different license types, with their terms
detailed at https://creativecommons.org/licenses/, plus a public domain
license. These dimensions are:

Attribution (BY): Others who use the work in the manner
requested by the author, but not in a way that suggests endorse-
ment. Permission is required to use the work without assigning
credit or implying endorsement.

ShareAlike (SA): Others may copy, distribute, display, perform,
and modify the work, so long as all modified work is distrib-
uted on the same terms. Permission is required to distribute the
work under other terms.

NonCommercial (NC): Others may copy, distribute, display,
perform and modify the work unless NoDerivatives is also cho-
sen for any noncommercial purpose. Permission is required for
commercial use.

NoDerivatives (ND): Others may copy, distribute, display,
and perform only original copies of the work. Permission is
required to modify the work.

Public Domain: This allows all users to distribute, share, and
modify an existing work without restrictions. The Creative Com-
mons license is ideal for digital repositories because it makes the
assumption that a work can be reproduced and shared. Since one
of the primary purposes of a digital repository is to allow for the
distribution of digital materials, requiring authors to acquire a
Creative Commons license for inclusion within a digital reposi-
tory allows the organiza tion to solve a number of distribution-
related challenges. More over, the Creative Commons organization
itself provides a wizard at http://creativecommons.org/license/
to help authors select the specific type of Creative Commons
license that best reflects how they want their materials used.
For example, to make the most restrictive license that prohib-
its crea tion of derivative works, restricts all commercial use, and
requires attribution as requested by the creator, the symbol and
textual representation would be:

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