I can't play movies in HD, but last week I could?

Just last week I watched How To Train Your Dragon 2 in HD with my cousins on my laptop after I bought it on iTunes. This wasn't the first time I watched it, and I did so with no problem both times.
I'm trying to watch it again now, but I keep getting an error message when I try to play it that says, "To play 'How To Train Your Dragon 2' in HD, you must have a computer with a built-in display or have it connected to a display that supports HDCP".
Why is it saying this now? I didn't have a problem before and I haven't downloaded anything different on my computer since then. I haven't even updated iTunes. Nothing has changed on my computer. What is going on?

If you are running 10.8.2 update with the new release 10.8.2 supplemental updater.

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