What a n:1 switch should do is pass the HDCP of the selected input to the output. I've read that some do that, but some 'remove' it. They do that by acting as if they were an HD display - spoofing the signature of a registered device. (This is 'illegal'.)

An HD source, such as a blue-ray player, just wants to know that the device on the other end is not capable of recording - i.e. it's a display. Then it will send HD. If not it should send SD. (Can you specify that your blu-ray sends an SD picture?)

With such a switch you can send an HD signal to a recorder. Or to a non-HDCP compliant TV.

This is all stuff I read while trying to solve the DHCP errors with my Sat box. Which isn't even HD. The new LG TV hasn't had a problem with it - so far. But a 'smart' TV can screw it up OTA.