From the article:
When we went to our seats, the wait staff let us know that despite the fact that the previews were playing, we wouldn’t know until the movie actually started whether we could see the film or not. If it didn’t work, the screen would just turn black. Luckily, the film went through without a hitch.
Not familiar with cinema projectors, but as I have gatherered from this forum problem is caused by KDM (used to decrypt movie) provider / reseller called Deluxe. Neither Sony or this cinema chain is at fault and problem indeed seems worldwide.
Find it very hard to believe to be honest. Could this be simply some rumour from colleagues? Doubt any vendor would implement anything like this, drives could be simply encrypted to protect data if they ever get stolen.