you can only use the DAC for the 'redbook' (i.e. NOT sacd) signal.
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There is a mod shop in Switzerland who will sell you a modified multichannel player (SACD and DVDA) with digital outputs, probably PCM that the standard DAC can handle, for all six channels. They will also sell you the circuit boards if you want to mod your own player. Evidently Sony's control of the industry does not extend to Switzerland!
The answer, in general, is that all digital outputs from an SACD must be encrypted in some way or other, at least if you play by the rules of the SACD licensing agreement. So, the relatively standard links that RW mentioned do this. In addition, there are the proprietary connection schemes of Accuphase and Esoteric.
There is no 'off-the-shelf' way to get and play with the digital information, except for the DVDUpgrades mod.
Denon uses Denon Link which is an RJ45 connection between their receivers and SACD/DVDA players. There is also I-Link which Sony uses and various other companies use their own methods of sending encrypted digital signals between player and processors. Some of these schemes work with other companies' devices. I believe Denon Link and I-Link will work with various processors.