I used to do a lot of restoration work for Wikipedia and Commons. When I left, I still did restorations as a hobby, and recently gave permission to have these coied over, under a CC-by license.
I live in the UK, so have a right to claim copyright on restorations, under the Sweat of the brow doctrine. (indeed, I believe UK copyright law technically doesn't actually allow me to release into the public domain as such). I want my work to be widely used, but am concerned that a lot of it was being used by unscrupulous poster companies to sell posters at vastly inflated prices by using my work, and, as such, wanted to use minimal possible protections, and CC-by is very much a minimum protection that still allows all usages, just gets them to note that what they're using is, indeed free to use and not done by them.
However, I am told - at http://en.wikipedia.org/wiki/Wikipedia:Featured_picture_candidates/First_col... that Wikimedia has a policy that coyrights *must* be violated. If this is true, I would like to know, as it would mean I want to no longer make the large versions of my work available for general download.
Cheers,
Adam Cuerden, Upset Copyright Holder