DRM punishes the people who bought the software. After the, at most, few days it takes to bypass the DRM, all of those who illegally download the software are rewarded with a fully functional copy of the software without the DRM. There is no such thing as DRM that doesn't cripple the functionality of the software regardless of what the companies that sell DRM may say. By utilizing DRM, software publishers are removing all of the incentives to buy their software -- including the moral incentive. Sure everyone knows it's wrong to illegally download software, but many people also feel strongly that it is wrong for the software companies to limit how they use what they legitimately paid for (for example, requiring a disc to be in the drive at all times, requiring internet connection to authenticate, having background programs running to authenticate). That same frustrated user, who bought the software, sees the guy who illegally downloaded it enjoying a greater level of functionality because it is free of the DRM. How does DRM discourage piracy?
FTC Town Hall to Address Digital Rights Management Technologies - Event Takes Place Wednesday, March 25, 2009, in Seattle #539814-00272
FTC Town Hall to Address Digital Rights Management Technologies - Event Takes Place Wednesday, March 25, 2009, in Seattle