Issue playing movies downloaded from iTunes on TV when linked to computer via HDMI cable.

Recently I purchased the advance digital copy of "Star Trek Into Darkness" as it was it was released just in time for moving some people into another state; we planned to watch it when we rested for the day. After hooking my windows 7 laptop up to a Samsung flatscreen TV using an HDMI cable, iTunes refused to play the movie. It would play when the computer was disconnected from the TV, and the same error would appear when reconnected. The error stated that I had to be connected to an "HDCP compatible device."

Is this some way of iTunes forbidding me from watching movies downloaded from their service when connected to an exterior device? My computer has no issues playing other content, such as netflix, when connected to a TV.

For me it's pointless to buy movies now from iTunes; I feel like I've wasted $20. Why on earth would I want to sit in front of a computer to watch it when there's a TV five times the size available?