Quotable: Alec Meer on Official No-CD Patches
Rock, Paper, Shotgun's Alec Meer points out the inherent rub of official no-CD patches to games that are released after the games are long in the tooth, as Blizzard recently offered for Warcraft 3:
I’ve always found it fascinating when games do this after release. It’s an admission that copy protection is just an irritation to legitimate players, and that disc checks are a particularly buffoonish and archaic anti-piracy measure at that. ... And is there really anyone still playing W3 after all these years who didn’t apply an unofficial no-CD crack long ago?
Warcracked III [RockPaperShotgun.com]

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It's not an admission of anything like that. If anything it's the reverse: releasing the patch is a statement like "We're not going to make any more money from sales, so we're removing the anti-piracy stuff. Now you can distribute and play it freely".
If the companies believed that the disc-checks were pointless and did nothing to prevent piracy, they'd see no reason to release the patch.
You know, I've only had problems with copy-protection on Windows games. I've never had trouble making and using disk images for OS X games, including Warcraft 3 (yes, I bought it).
I'm not sure if this is because OS X's architecture somehow doesn't allow an application to see if a mounted volume is a physical CD or not, or if it's just that publishers don't really care about potential losses of OS X version sales due to piracy because OS X is a small portion of the market.
Starcraft has been out for TEN years and it also just received a similar patch. Although a nice gesture on Blizzard's part, I've been working with disc images of Blizzard games for a while now (on a XP setup no less)
The patch was released because unpatched installs are more of a pain in the ass. There are some reasons for releasing it later, and some reasons for releasing it earlier, and at some point in time they balance out and the patch is released -- whether it ever helped against piracy or not.
Err, sorry, I meant whether the CD check ever helped against piracy or not.