The Super Audio CD crypto algorithm needs two keys for descrambling:
1. The PSP-PDM key that is hidden in the disc; and
2. The “Initial Values”, a key that is hidden in the IC
(integrated circuit). The value of
these keys is not available outside a single IC and is not transmitted
between IC’s.
http://sonicstudio.net/pdf/dsd/SACD_TechOverview.pdf

Content encryption. DSD data is encyrpted with an 80-bit key on the
disc.
The key is never transmitted on any bus, or anywhere outside the
proprietary SACD chipset.
SACD’s encryption and decryption are available only in carefully
licensed and controlled hardware.
http://web.archive.org/web/20071011020215/www.smr-home-theatre.org/surround2002/technology/page_09.shtml

"carefully licensed and controlled hardware"


-- 
mortslim
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