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CC: Creative Commons license.
BY: Attribution to original author required.
NC: Content is restricted to non-commercial use.
ND: Users may not derive or modify the content.
SA: Content may be shared and re-used only under the original license terms.
Custom License: The author(s) have created their own open license. Follow the link in the listing for details.
EMUCL: Educational Material Universal Common License.
GFDL: GNU Free Documentation License.
GGPL: GNU General Public License.
OPL: Open Public License
PD: Public Domain – Content is free of any know copyright restrictions.