Topic summary
HDCP
Extracted from the Wikipedia article High-bandwidth Digital Content Protection.
Circumvention
HDCP strippers decrypt the HDCP stream and transmit an unencrypted HDMI video signal so it will work in a non-HDCP display. It is currently unclear whether such devices would remain working if the HDCP licensing body issued key-revocation lists, which may be installed via new media (e.g. newer Blu-ray Discs) played-back by another device (e.g. a Blu-ray Disc player) connected to it.