CD Projekt RED announces the release of Patch 1.1, which brings important improvements to The Witcher 2, the highly acclaimed game released a week ago. The most noticeable change is the removal of the DRM protection world-wide. This gives players the freedom to install and play the game on any number of computers, and no activation code is required.

Other notable improvements include frame rate increases of approximately up to 30%, especially noticeable on DRMed versions and low spec systems, better stability, and non-problematic installation of free DLCs
http://www.en.thewitcher.com/community/entry/35/