In order to clear up this issue for people who make use of CC photos, and who license photos under CC licenses, we offer the following reference: http://creativecommons.org/faq#What_if_I_change_my_mind?
This provides some security for people using CC photos, and should cause people applying these licenses some pause to consider if this is what they really want to do. At everystockphoto.com, our policy is still to de-list photos on request out of respect for the photographer, rather than legal requirement.
What if I change my mind?
Creative Commons licenses are non-revocable. This means that you cannot stop someone, who has obtained your work under a Creative Commons license, from using the work according to that license. You can stop distributing your work under a Creative Commons license at any time you wish; but this will not withdraw any copies of your work that already exist under a Creative Commons license from circulation, be they verbatim copies, copies included in collective works and/or adaptations of your work. So you need to think carefully when choosing a Creative Commons license to make sure that you are happy for people to be using your work consistent with the terms of the license, even if you later stop distributing your work.
Ihr erinnert Euch wegen dem CC-Gedönse? Das Thema hatten wir hier vor einigen Wochen besprochen, wie es sich nun mit diesen CC-Lizenzen verhält. Siehe Creative Commons Falle: Einladung zum Kopieren? und Blog unter Creative Commons-Lizenz: Erst nett, dann evil?