That may be true (I don't know), but is it really effective? Are there many DRM schemes that have been out for more than a few months and haven't been cracked yet?

In the case of the N900 it's hard to point to lack of DRM as the cause when there are so many other good reasons for commercial developers to not bother (small target market compared to competition, Ovi store brokedness, still-born platform). The ones that did bother (eg Rovio or Sygic) generally seem happy with the return on their investment even without DRM.

We know DRM will come in Harmattan. We also know it will be possible to flash a different kernel, but doing so will deactivate the hardware support so DRM "content" will stop working. Which means as soon as you step outside the official signed Nokia kernel for whatever reason (maybe you want some unsupported filesystem, or IPv6, NAT, KEXEC, you get the idea) you stop being a potential customer. I wonder whose foot exactly is getting shot by this...