An HDCP handshake occurs when a source like a Blu-ray player sends data to a receiver (TV /display) requesting an authorization key. The display processes it and replys with an authorization key. If the source accepts the authorization key, the signal transmits to the display. A problem can occur when there are multiple displays because there are only a certain amount of keys available (usually 1- 16).
There are digital switchers being developed to accomodate this problem. So the next time you're in a club or bar with multiple high definition displays you can see why designing a system around our new digital era is not as easy as it looks.
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