macuahuitlgog: Do Blizzard games have DRM?
Games that are DRM-free (if we exclude the serial number which is required only if you want to play on Blizzard's legit Battle.Net servers):
Warcraft 3 and the expansion
Starcraft and the expansion
Diablo 2 and the expansion
Here's what you'll do. If you buy the games, create a Battle.Net account, and use the above games' serial numbers to register your games there. Then you can download an up to date version of the games that don't have DRM.
By the way, afaik, back in the days, Blizzard were using their own custom disc check DRM.
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World of Warcraft can't be considered a DRM filled game because it is a MMO and as a such you obviously need an account to play online. Other than that account, nothing else is required. :)
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Starcraft 2 has a custom "DRM", similar to what Diablo 3 will be using. You'll be able to play the single player "DRM-free" (offline mode) if you log on at least once every 30 days. You need your account for playing on Battle.Net's servers.
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Long story short, they don't use DRM, because you need an account to play online, similar to almost every multiplayer game out there.
My view. :)