I thought the Denon Link was proprietary. The link can only be used with Denon products. This is from the review at Audioholics on the Denon 3805:

DENON Link 3rd Edition

Break out the champagne, Denon has enabled native DVD-Audio (MLP) and SACD (DSD) support with DENON Link 3rd Edition (included on the AVR-3805 and fully active). Once approval from SACD licensers is given for transmission from Denon Link 3rd-enabled DVD players, you will finally be able to connect ONE CABLE from the player (like the DVD-5900 or future players) to the AVR-3805 (or AVR-5803).

Note: DENON has already submitted 'DENON Link 3rd Edition' to Super Audio CD licensers and content holders for the purpose of obtaining approval for transmitting multi-channel digital signals of Super Audio CD, and this is currently in the approval process. The digital transmission of Super Audio CD to the AVR-3805 or AVR-5803A from players equipped with 'DENON Link 3rd Edition' will become possible upon completion of the aforementioned approval process and at the stage where formal approval has been obtained. DENON plans to make notification concerning details of the implementation period, method and price of updates to 'DENON Link 3rd Edition' for DVD players which have been sold, and are currently equipped with 'DENON Link 2nd Edition (SE)'.

D-Link worked flawlessly for me, allowing the AVR-3805 to handle all bass management and processing for DVD-Audio as well as DVD-Video discs. Getting the D-Link connection is as easy as enabling D-Link in the DVD player (in this case the DVD-5900), setting your Digital Audio Assignment for the DVD Player to DLINK in the AVR-3805 and connecting the D-Link cable (which should be included with Denon Universal players.) In the event that you have a Denon DVD Player equipped with DENON Link 2nd Edition, you can set the DVD input to switch to the external Multi-channel inputs whenever a D-LINK signal is not present, thus allowing your player to send SACD to the AVR-3805 through its multi-channel inputs (this function is enabled by default.