I'm not sure about DRM, but an interesting point which is often unmentioned is the VC-1 codec. Microsoft licensed it for HD-DVD, so they threw their weight behi

I'm not sure about DRM, but an interesting point which is often unmentioned is the VC-1 codec. Microsoft licensed it for HD-DVD, so they threw their weight behind it. When comparisons were dinging Blu-ray for artifacts in red colors, Sony also licensed the VC-1 codec. Microsoft then made a penny or so on both formats, since both were using their codec, so they pulled their army out of the fight. This may very well have been the tipping point for Blu-ray.