What license for themes for distribution in ikiwiki?

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+### What license do themes need to have for distribution?
+
+Could someone specify what license the themes need to have to get distributed in ikiwiki or Debian? The current included theme seem to be under the GPLv2. Does the [Creative Commons Attribution 3.0 Unported License](http://creativecommons.org/licenses/by/3.0/) also work. This way a lot of free CSS templates could be included, e. g. from [freecsstemplates.org](http://www.freecsstemplates.org/).