OK. So, SCMS strippers don't remove SCMS. They change the SCMS status to pass-by
the interdiction.
If I play a digitally recorded MD on a deck and I use a SCMS stripper between
the optical out of the deck
and the optical in of a recorder, I'll pass-by the SCMS interdiction. But what
will be the SCMS status of this new digital copy (unlimited copy or one
generation allowed?)?
David W. Tamkin a écrit:
> Jeanmougin wrote,
>
> | When you make a copy of a CD with optical cable, SCMS is implemented on
> | the MD.
>
> SCMS was implemented on the CD to start, but it was set to allow one gene-
> ration of digital copying. Permission to copy does not mean absence of SCMS:
> SCMS is the *system* (that's what the second S stands for) and it is imple-
> mented on all consumer digital audio media.
>
> [The problem with saying "this doesn't have SCMS" or "there's no SCMS here"
> to describe an SCMS-compliant recording that allows copying is that saying
> it that way destroys the distinctions among (1) a recording or signal whose
> SCMS bits allow one generation of copying, (2) a recording or signal whose
> SCMS bits allow unlimited generations of recopying, and (3) a storage format
> {such as a .wav or .mp3 file on a hard disk} or a transmission protocol
> {such as AES/EBU or an analog signal} that truly does not carry SCMS infor-
> mation. Only type #3 can properly be described as "not having SCMS."]
>
> | The copy bit 10 is written and prevents a second generation digital copy.
>
> "10" is the designation for "no further digital copying" on DATs; on MDs it's
> actually "01" (in bits 6 and 5 of the segment's status word).
>
> | But is it the MD recorder that puts SCMS protection on the disc or does the
> | MD recorder only write the copy bit of the source? In other words, is it
> | the digital out of a deck (CD, MD) that sends the SCMS status or is it the
> | MD recorder that writes the SCMS status during recording?
>
> Both. (Pardon the anthropomorphisms here, but they do facilitate the expla-
> nation.) The source machine reports the SCMS status of whatever it is play-
> ing and the destination machine decides how to respond. If the source sends
> out "I am playing an SCMS-penultimate recording" in its S/PDIF output, then
> the destination machine decides "This signal is SCMS-penultimate, and I obey
> SCMS, so I must mark the copy I'm writing as SCMS-final." When you try to
> copy an SCMS-final source digitally, it is the destination machine that de-
> cides, "This signal is SCMS-final, and I obey SCMS, so I won't record it."
> A professional-grade recorder might have logic instead of say, "I'm receiving
> an SCMS-final signal, but my switches are set to disobey SCMS and to write
> SCMS bits that allow unlimited recopying (or to write SCMS bits that allow
> one more generation, or however the switches are set), so that's what I'll
> do."
>
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