The Wikipedia article on Creative Commons licenses says that it is not a free/libre license:
Description Acronym Free/Libre ==================================================== Attribution + NoDerivatives BY-ND No
However, the Free Software Foundation does include it on their list of Free "Licenses for Works stating a Viewpoint (e.g., Opinion or Testimony)". In fact, they use it themselves.
This is the license used throughout the GNU and FSF web sites. This license provides much the same permissions as our verbatim copying license, but it's much more detailed. We particularly recommend it for audio and/or video works of opinion.
The full list of licenses on the OSI site does not mention any Creative Commons license, though the site itself is licensed under CC BY.