Peter Ansell schreef:
How long has "GNU Free Documentation License, Version 1.2 or any later
It used to be version 1.1... how many base version changes are going to happen?
At least one: to a version of the GFDL which is compatible with a CC license.
Note that this is entirely legal. An early contributor to Wikipedia would have licensed his contribution as "GFDL 1.1 or later". This gave Wikipedia the right to distribute unchanged and modified versions of that contribution under any GFDL version larger than 1.1. With the change in the Wikipedia license, we chose to only use part of the rights granted to us: namely, those in GFDL 1.2 or later. That's an option given by the original contributor.
Personally, I would have preferred to give our downstream users the widest available choice of licenses: so GFDL 1.1 or later. WP chose otherwise.
Note that those early contributions are still available under the GFDL 1.1. Wikipedia just chooses not to publicize that option. If a copyright holder wants to do that, he can, for example by including a statement to that effect on his user page. Such statements can only add licensing options (such as dual licensing), not take away (for example by refusing to release your edits under the GFDL; or by insisting on invariant sections. People have been blocked for this).
Eugene