In late 2009, the gaming industry witnessed one of its most controversial experiments. With the release of Assassin’s Creed II on PC, Ubisoft introduced an aggressive "always-on" Digital Rights Management (DRM) system. The concept was simple yet draconian: to play the game, a single-player experience at its core, your computer was required to maintain a continuous internet connection with Ubisoft's authentication servers.
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The "21" in your search could very well be a version number from a specific warez group or repacker, as dozens of modified files and automated patchers were shared across forums and file-sharing sites in the months following the game's release. In late 2009, the gaming industry witnessed one