I looked at the link and the only thing I can dig up is this but still does not explain why.
Try reading the following from the same post:
2. The programmes are tagged "copy once".
However.
3. Some DVD recorders are refusing to even copy once.
4. The manufacturers of these recorders could not explain why (to my professional contacts).
5. It is postulated that the DVD recorder manufacturers can not guarantee the disk they create is not copyable, so they don't make even one copy...
Why is it the laws in the past allow you to get a VCR and record and the laws do not allow it now?
1. VCRs
did respect macrovision so that you could not record copy protected material like purchased tapes or DVDs onto VCRs from DVD players or other VCRs.
2. VCR have such poor quality that no-one cares any more.
3. There have been almost no VCRs sold lately - again no one cares about VCRs any more
4. When people started purchasing and using DVD recorders to record broadcast TV, they decided to preclude making more than one copy - so that you could time-shift, but not make copies of your recording for others - hence the "copy once" flag - these recorders were used without STBs. They did not implement the more harsh "copy never" flag, however, when STBs came into play, it became difficult to copy to DVD recorders that respected the flag. This is mostly a non-issue now since so few people use DVD recorders and STBs since the hookups and programming these to work is so convoluted.. The "geeks" use HTPCs and most people use PVRs for time-shifting.
How long has CGMS been around ? I read in a thread you post about from 2005 to now is very hard to record but before 2005 was better why was that
5. As indicated in the link in the CGMS-a thread to the Wikipedia site, CGMS-a has been around since about 1995, not 2005 - 1995 is roughly when DVD recorders came to market and in anticipation of DVRs like TiVo. Earlier DVD recorders didn't have the technology to "respect" CGMS-a, that's why it became an issue later - like say 2005. Also the studios didn't bother with CGMS-a much before then for their programming. Also, sometimes the service provider's STBs "stripped" the CGMS-a signal, but the studios asked them not to strip the signal.
6. HDMI and HD has nothing to do with CGMS-a since HDMI and HD are
digital while CGMS-a (the a stands for)
Analogue. Please do not confuse the various other flags around which affect other aspects that we are not discussing here. (5C, Broadcast, HDCP, etc)