A while back, got an album from Rhapsody of Fire that came with a documentary in video format, M4V file.

Testing on VLC on a system other than the one I downloaded in, it seemed to work too.

Then today, tested with 3 other videoclips, För redeliga män from Nordman, Christmas Truce from Sabaton, and Mister Jewel Box from Tophamhat-Kyo, all 3 in M4V format, and all 3 working on VLC on a system other than the one I downloaded in.

As information is scarce on ITunes, specially with information usually pointing to the opposite, being DRM-ridden, unsure if it was luck 4 times in a row, or if ITunes for videoclips, or perhaps even videos overall, is mainly/exclusively DRM-free, but so far a good sign!