"David W. Tamkin" <[EMAIL PROTECTED]> writes: > Sony MD recorder manuals, in describing SCMS, have always said that signals > from digital satellite broadcasts can be either SCMS-penultimate (you can > record them but you can't copy the recording digitally) or mysteriously > SCMS-antepenultimate (you can record them and copy that recording digitally > but SCMS prevents making a third generation digitally). We've never found > an answer to what distinguishes the latter from the former, or how the latter > can even happen (unless the source medium code tells an MD recorder to mark > the recording as SCMS-penultimate). > [...] > So, per Yamaha, when a second generation is possible, so is a third. The > tuner output includes SCMS status bits, and they work like those of any other > source, and there's no anomalous antepenultimate setting. That completely > disagrees with Sony, according to whom it's possible sometimes to make a > second generation within SCMS but never a third. Hi David, I remember reading somewhere that S/PDIF copy protection is a product of the SCMS bits and the Category Code and that recording equipment looks at both the SCMS status and whether the source is broadcast digital audio in order to determine whether copying is allowed or not. I've found a partially substantiating reference for this on page 7 of the Crystal Semiconductor Application Note 22: http://www.cirrus.com/ftp/pubs/an22.pdf "Overview of Digital Audio Interface Data Structures, (FEB'98, AN22REV2: 117 Kb)". (Crystal Semiconductor has a lot of interesting looking application notes by the way: http://www.cirrus.com/products/apnotes.html). Of note is that the L bit (original/copy) is interpreted oppositely for these two classes: 1) "Broadcast Reception of Digital Audio" and "Laser optical" 2) "All other" So, I think the Yamaha statement is wrong, unless they implement an unconventional copy protection for Digital Broadcasts. Didn't I also recall reading on MD-L that people experience oddities recording from laser optical devices? Rick ----------------------------------------------------------------- To stop getting this list send a message containing just the word "unsubscribe" to [EMAIL PROTECTED]
