Backwards compatibility? Not every film in existence has been digitized yet. One film projector equipped screen out of a ten screen multiplex is a modest investment. Although the lack of people who know how to run them may make it a moot point.

The new format is already causing problems with film festivals that often have last minute scheduling changes of venue. The encryption keys are apparently very time sensitive.

Has anybody peeked in the windows of older theaters to see if the film projectors were left in place?