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Good to know.

ive got the KeyDigital KD-X400 Pro K. It’s been basically bullet proof. It supports some flavors of 4K. So it might be sufficient for a projector. http://keydigital.com/emails/KD-X400ProK_X600ProK_Email/KD-X400ProK_X600ProK_Email.htm

Yes

But for my theater I’m probably going with an ethernet extender. I currently have Cat5 run in wall with an HD capable ethernet extender. Not sure it does 4K. I think it’s easiest to buy a new extender than to attempt to get an HDMI cable through the run. 4K HDBT Extender Kit HDR 18GBPS HDMI...

RUIpro also on my list. I’ve seen it recommended multiple times.

I’ve got these wishlisted from reccomendations I’ve seen. I’m not very smart on the confusion of 4K HDMI cables. I think all you need is HDMI certified for 18Gbps, but mostly I bookmark what other people say is good.

These optical cables are AFAIK meant for long runs, 30’+ where regular cables have problems with signal loss and degradation. If you have a short run, there are plenty of conventional, electrical cables that are much cheaper.

There's a small electro-optic (EO) device that converts the electrical digital signal to optical digital signal at the input side. That propagates by fiber. At the output side is another EO device to do the opto-electronic version back. (to my surprise, I can't easily find a "how's it work"...