[opendtv] Re: CGMS-A issues (was: HDMI issues)
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 2 Mar 2006 11:23:05 -0500
Kilroy Hughes wrote:
> Nobody agrees on what "copy once" or the other two states
> mean when you put it to the test.
Not sure I understand why this should be difficult, in this specific
broadcast case. Even if it can get difficult in the broader context
(clearly it can).
The copy prevention should only apply to content in a pre-recorded
medium, e.g. to prevent copying between DVD and DVDR, pre-recorded VHS
and DVDR, etc. But when content is broadcast, it must not apply. That
should be simple.
If the broadcast flag is set, the content cannot be indiscriminately
retransmitted across the Internet, but it must still be allowed to be
copied for personal use.
I'm also not sure I understand why CE vendors that don't honor these
rules don't get fined.
In coding for IP communications, there is a dictum which I think applies
here too. "Be conservative in what you transmit, be liberal in what you
receive." In this case, that would be translated to "Don't set a copy
never CGMS code when broadcasting, ignore a copy never CGMS code when
recording broadcast content." That is the intent of the FCC ruling and
of the US Court of Appeals, it seems to me. An OTA or cable receiver, or
a recorder with built-in RF receiver, should have no problem
implementing a compliant design. What comes in that RF pipe cannot be
sent out with a copy never CGMS code.
Bert
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