(re: re: re: Sierra and Half-Life 2) Valve haven’t lost any source code (i.e. it has not been deleted). Valve have to slip the release date so they are able to rewrite the code to ensure the game is not compromised on release. The Half Life brand is a major cash cow for all companies involved and if it’s unplayable online (due to cheats/hacks) it will quickly die out and not generate the massive revenue that Half Life 1 has. Although HL1 has cheats/hacks – none are at the level of the source code and so (given a little time) are circumventable with a patch or other means. HL2 could have had cheats created at the engine level that would be nigh on impossible to identify/prevent running.