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"CEG (Custom Executable Generation) is Valve's alternative to the pitfalls of DRM and part of Steamworks, the company's free suite of publishing and development tools. What this technology does is register each copy of a game unique to one user, who can then use the title between compatible PCs without any kind of limits or root kits.Steamworks was also updated with support for in-game DLC and matchmaking, the latter of which many have enjoyed for quite some time in the PC version of Left 4 Dead."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/03/25/valve-introduces-drm-alternative-ceg-for-steamworks/>