DRM is dying out and where it still exists systems like Steam make it easier. Battlefield Bad Company 2 for example had 5 activation limit (you could have it on 5 computers) on the Disk version but on Steam it had unlimted because it was managed on steam. Apple stripped DRM out of their MP3s on i-tunes because it was just counter productive.
Anyone seen E3 this year? Sony (massive on the DRM front) have been effectivly tbagging Microsoft with regards to their lack of restrictions on what gamers can do and DRM in their products.