Eric,
Some DVI connections are compatible with HDCP, but I wouldn’t be surpirsed if your 5 y/o projector isn’t. If it’s not, you will not be able to get a video signal to it other than via RGB, which you already know. Also, component only supports 29.97i so your progressive discs will get converted on the way out.
Max
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Blu-ray producer
New York
Area4.tv