CANNOT PLAY HD CONTENT BECAUSE MY 24" APPLE DISPLAY NOT "HDCP" AUTHORIZED

Hi I'm sure this topic must have come up before but nothing came up in a search. I'm trying to play an HD TV show and I can't on my 24" Apple cinema display hooked up to my 15" Macbook pro core 2 duo through a mini DV port. I'm getting the error message that the display is not authorized to play HDCP protected movies. How can this be when it is an Apple display and why am I getting this message on a free HD video? I also have not been able to play any itunes video on my external display in full screen mode. When I go to full screen mode the video transfers to the computer screen. I'd appreciate knowing if these are common problems and if this is what Apple has designed or if this is a fault and if there is a solution to these problems?
Thanks For any help.

Hi BSteely thanks for the reply! I have a newer Apple 24" Cinema Display connected through a Mini DisplayPort (pardon my error tibor.moldovan) and it has supported HDCP, but the other day I got an error message when I tried to play a HD video in iTunes saying that my display is not HDCP authorized. I had had that error message previously when trying to play HD content on a TV attached to my computer but not when playing it on my Apple display, so I was surprised when it happened.
+"The issue of full screen video coming back to the computer's screen (I assume you mean on the MacBook Pro) is expected. The way to work around that is to make the external screen the primary screen. This can be done by running the MBP in closed clamshell mode with only the external screen being active."+
Thanks so much for the explanation about the full screen issue. When I first got my external screen and I went to full screen mode it played in the external monitor, but after an upgrade it stopped doing this. I will give this a try.

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