For gollum code, everything should fall under the existing MIT License.
Alternative permissive licenses (such as BSD) for 3rd party dependencies are
acceptable. For image assets in Gollum, CC BY or CC BY-SA is fine. Anything
released under a copyleft license (for example GPL, AGPL, LGPL, MPL, EPL,
etc.) is not permitted in gollum. Public domain, CC BY or CC BY-SA for code in
gollum is not permitted.

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The following PNGs are based on Ubuntu 11.10 SVG files located in /usr/share/icons/unity-icon-theme/places/svg/
- group-folders.svg
- group-files.svg
- group-downloads.svg

  lib/gollum/frontend/public/css/document.png
  lib/gollum/frontend/public/css/folder-horizontal.png
  lib/gollum/frontend/public/css/toggle-small-expand.png
  lib/gollum/frontend/public/css/toggle-small.png

Creative Commons - Attribution Share Alike
https://launchpad.net/unity-asset-pool
http://packages.ubuntu.com/oneiric/all/unity-asset-pool/filelist
https://bazaar.launchpad.net/~unity-team/unity-asset-pool/trunk/view/head:/COPYRIGHT

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The css-tree-menu code is used under the MIT license.

http://www.thecssninja.com/css/css-tree-menu
http://www.thecssninja.com/demo/license.txt

  lib/gollum/frontend/public/css/_styles.css