My general policy is to boycott products that support non-mandatory copy protection features since other competing products will likely not have those restrictions and I hate to encourage that sort of thing. That said, anytime on AVS I've seen posts about extra copy protection appearing on OTA broadcasts a few calls to the station were usually enough to get it changed, eventually.
FWIW I did do some low level software support for Line 21 captions & data on my last job since I had to make a Bluefish card generate and output those signals without library support for it. And I still have a legal paper copy of CEA-608-C (Aug 2005) here. This is older than John's copy but does have description of the relevant fields and I am not under any NDA for this one.
I don't think having it would really help much for your (Bert's) purposes but could legally furnish the info if needed.
- Tom John Willkie wrote:
Violations of FCC rules should be reported to the FCC as such, but you're more likely to get the station chief engineer to fix things. The only way I know of to send this type of data is in line 21, as an XDS data field in the CEA/EIA-608 data. (field 1 or 2). I only have the (yet to be released next edition of CEA-608; there CGMS-A is in section 188.8.131.52. The text is quite lengthy; too long to copy here, and to do so at this point would be premature as the document is being worked on by at least two groups and isn't final, and could put me into trouble with SMPTE's non-disclosure agreement. I guess I don't follow this area very closely (I only reference the captions in the caption_service_descriptor), but I'm wondering under just what rule the FCC has supposedly mandated that the FCC has stated one cannot set "copy never." The rules and the FCC's texts are what matters, not what is merely cited on the FCC web site (which is merely informative.) The (somewhat) equivalent data in digital is the redistribution control descriptor, which the FCC tried to mandate the use of in dTV sets, but was shot down in the courts. Broadcasters are free, however, to set the redistribution control. It's very rare that a broadcast engineer would set something to a value not permitted by the FCC, particularly in the FCC's home market. It's possible that one of the -608 or -708 boxes has these fields set to the most restrictive value, by default. However, I don't see how going to S-video would strip out line 21, so you just have a device downstream that doesn't care about CGMS-A. The spec mentions that the use might be affected by private agreements, so I think you are actually talking about receiver implementation issues. I would be very interested in seeing the actual data transmissions. I "think" all you have to do is to strip out line 21, but I don't really do analog. Anymore. John Willkie -----Mensaje original----- De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En nombre de Manfredi, Albert E Enviado el: Sunday, November 04, 2007 4:26 PM Para: opendtv@xxxxxxxxxxxxx Asunto: [opendtv] Q on digital OTA broadcasts I've been considering a Philips combo DVDR/PVR for Christmas. But in the owner's manual, it says something about copy protected broadcasts won't copy. In the past, when using an NTSC-only Philips DVDR, I discovered that many local broadcasters (apparently) set the "copy never" code in their analog broadcasts, in spite of the fact that the FCC has said time and again that time-shift recording is supposed to be allowed ALWAYS. I seem to have been able to sidestep this limitation by sending baseband video from an ATSC STB to the Philips recorder, using an S-video interface, so this hasn't been an issue for me in about the past three years. But I know that this gremlin is still lurking there in the background So, my question for broadcasters is, how are the ATSC transmissions encoded? Copy once? Copy never? Is this going to make me want to write letters to the FCC to get working right? If you tell me that I'm better off to keep doing what I'm doing now, I'm sure I can find other things to spend my money on. Not looking for aggravation. Many thanks for any informed replies. Bert----------------------------------------------------------------------You can UNSUBSCRIBE from the OpenDTV list in two ways:- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.
-- Tom Barry trbarry@xxxxxxxxxxx ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways:- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.