We recently purchased a Chromecast to cast to our old (but very good) computer monitor as a substitute TV. Unfortunately, the monitor doesn't support HDCP, so the Chromecast OS refuses to display anything. Is there anything we can do in software (I hear root can be achieved) to disable this requirement?
There is no official way of doing that; if you consider the reason behind the HDCP requirement, you'll realize that Google will not enable any means to disable that.