[Dovecot] Wiki license

Any suggestions as to what license to use for wiki.dovecot.org?

I should have specified this a long time ago, but luckily(?) most of the content is written by me, so I don't think there are going to be problems.

The main choices are:

a) GNU Free Documentation License

b) Creative Commons (Attribution-Share Alike?)

It could also be dual-licensed to both to maximize the distribution possibilities.