They lost the DRM war for music, but they're going to hold on a few more years on the video market. You'll be able to get legal DRM-free movie downloads in a few years once they buckled under the massive pressure from consumers the way they did for music. For now, I'd just buy the DVD and (if you want to have it on your computer) rip it to your hard disk. Be aware that ripping a DVD to your computer hard drive requires circumventing the CSS encryption on it, and the technology required to do this is illegal in the United States.
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WAR IS PEACE
FREEDOM IS SLAVERY
IGNORANCE IS STRENGTH