Well, as was originally stated, this issue has been argued both ways (will it/won't it) for a while now.
In a nutshell (my condensed version) that DVI/5C is very far off as a reality. Not only would encoding of existing HD material be needed, but, the new stuff coming online would require a new purchase for all the broadcasters.
Politically speaking, broadcasters want to get into as many homes as possible, movie producers want to protect their "property" as much as possible from theft. Since there is no advertising (in the classic term) with movies, their revenue is generated solely by sales. Broadcasters don't care, as they get revenue from advertisers.
This is a pretty wicked tug-o-war. The current FCC chair is more inclined to side with the broadcasters than the movie houses, as the FCC will have to foot the bill (litterally!) to pay for all the broadcasters with existing HD equipment to switch over to a new standard.
I can't remember where I saw it, but, PBS is required by law _NOT_ to send encoded/encrypted signals out to customers via OTA or otherwise. Part of their charter as a "public utility". If PBS don't do it, nobody will.
The reason nobody else will do it is because they all get federal dollars to help subsidise their broadcasts. (i.e. they get $$$ in exchange for being on the Emergency Broadcast System)
Its a nice little game the studios had going with the FCC. DIVX (not the MPEG encoding codec) died horribly because it was more of a hassle than a service. Same will hold true for DVI/5C. If the consumers don't buy into it, HDTV will never take hold.
One other perspective is that HDTV recording devices are still very esoterric, so the need for copy protection at that level is still far off. And even when it does come out, look at what has happened with DVDs. They cracked the DCSS in a matter of months, and now virtually any DVD can be copied. Just wait till HD-DVDs actually hit the market. Those will be cracked in a matter of minutes. <hehe>
If you purchase a new TV every 5-7 years, you will be safe. If your like my father with the same console television for 20 years, your screwed.
<we had to finally PAY someone to take that damn elephant out of the house before I could get him to buy a new 27" Philips...)
Merry Xmas, Happy Holidays!