There are no HDMI outputs or inputs on devices without the HDCP protocol.
When you say "once HDCP is enforced" you may be referring to flags rather then a device being compliant:
- To receive/transmit a signal with HDMI, there must be a handshake between the compliant sending device and the receiving device. The handshake involves a series of codes and the receiving device must be able to answer and provide its EDID (identification) code. Without the handshake there is no video/audio bitrate going through.
- Flags:
With HDTV: there could be a Broadcast Flag (one day, once, I believe, Congress legislates a green light to the FCC for OTA as well as cable/satellite) and under FCC rule, a broadcaster could give a 30 day advance notice of its intention to downrez the signal if the receiving/display devices are not compliant (HDMI/DVI HDCP)
For HD DVD and BR, movies may carry the ICT flag and if the player/receiver/display is not HDCP compliant, the resolution may be downrez to 540p (HD DVD player). The BR could downrez to 540p as well... if not, it will be 480p.