Is DRM bad business?

Cory Doctorow tells Microsoft why DRM is bad business:

Here's what I'm here to convince you of:

1. That DRM systems don't work

2. That DRM systems are bad for society

3. That DRM systems are bad for business

4. That DRM systems are bad for artists

5. That DRM is a bad business-move for MSFT

DRM frustrates the average consumer while failing to prevent outright piracy. DRM precludes innovative uses of technology. Anti-circumvention laws are anticompetitive.