Adobe has posted some information and a fix for the recent issue with Adobe Photoshop CS6 registration/activations:
This issue appears to have been triggered by the Photoshop CS6 13.0.2 and/or 13.0.3 updates. The official recommendation on a fix is to update Photoshop CS6 to 13.0.4, then use the APTEE tool to remove and reapply serialization. See the above post for more details.
The APTEE tool is not exactly easy to use to deploy this fix in an enterprise environment; you need to install it on all your machines and also run a script (which you must write, test, and debug) on all your machines to perform the unserialization/reserialization.
Later today I will post a tool to help you create a standard Apple package to perform these steps. If you have some way to distribute and install Apple packages on your machines, you’ll be able to do the unserialization/reserialization by installing a package.
Check back later!