Prosecution and persecution are two different things. Persecuting anyone is not a good time :) Why, if you're not allowed to release under a license, should yo

Prosecution and persecution are two different things. Persecuting anyone is not a good time :) Why, if you're not allowed to release under a license, should you be able to release all rights reserved (which can still be a copyright violation!)? If you need to prosecute the person, there are established procedures for that: DMCA, or ultimately a lawsuit over the infringement. That you didn't identify yourself publicly on the site does not make that impossible. In fact the point of the DMCA was to make it easier to handle this - because if the provider doesn't comply with your DMCA, you can sue the provider.