Kneecapping HDCP

Dear Lazyweb,

I have a projector that has DVI-D input and I want to feed it HDMI from PS3 and Mac. That means, I think, I need to convert HDMI to DVI-D with forged HDCP credentials.

I seem to recall seeing such devices for sale at some point. Do they exist? Have you actually used one?

The projector also has SVGA and Component inputs, but I'm trying to avoid an analog phase.

I have determined that plugging a PS3 into it via a passive HDMI→DVI-D converter results in a black screen (a Mac input works, though, which indicts HDCP.)

Previously, previously, previously.

Tags: , , , , ,
Current Music: Chvrches -- Gun ♬

29 Responses:

  1. DVI-D can carry HDCP. You need an HDCP compliant cable, however. Is the projector HDCP compliant?

  2. If the projector itself isn't HDCP compliant, then yes, you need a spoofer. You won't find an HDCP spoofer easily, but that doesn't mean they don't exist.

  3. pnuk says:

    I've not tried it so YMMV http://www.hdfury.com/hdmi-hdcp/hdcp-converters-and-strippers-boxes/
    Brace yourself for disappointment just in case.

    • jwz says:

      As far as I can tell, the HDFury products produce analog outputs. While this might improve matters by putting the analog source closer to the projector instead of on the other side of the room, I was trying to avoid an analog step entirely.

      • not the HDFurry4. that has digital out.

        • tkil says:

          not the HDFurry4. that has digital out.

          From what I read, it seems the factory firmware disables digital out if HDCP is encountered on the digital input. Might be worth verifying this behavior before dropping 300+USD on one.

          It seems there are fairly well-known alternate firmware loads, however.

  4. Mrbill says:

    Perhaps this:

    https://www.adafruit.com/products/609

    A writeup by Bunnie here:

    http://www.bunniestudios.com/blog/?p=2117

    Bunnie is a clever chappy.

    • jwz says:

      I see nothing there that suggests that this device solves the problem I asked about.

      • Tony Finch says:

        The NeTV includes an HDCP implementation in order to encrypt an overlay that it adds to an encrypted video stream. It doesn't decrypt video. http://rdist.root.org/2011/09/13/the-magic-inside-bunnies-new-netv/

      • Mrbill says:

        You are correct - sorry about that. Perhaps it could be the beginnings of a hack - but i'm sure you're not interested in that :)

        • jwz says:

          No, it really couldn't be the start of a hack, since that's not even remotely what it does.

          • You need a hack that does the inverse: a splitter that sends the DCC signals to an HDCP display, and the video signals to your projector. I wonder what the cheapest HDCP display costs, and if pliers + some totally bogus HDMI "Y" style cable could be bodged into service.

          • Jered says:

            First: while neat, jwz is clearly looking for a solution that is more Mac than Linux (i.e. works out of the box vs. search the internet for appropriate drivers, recompile your kernel, find it doesn't work, download a sketchy patch, recompile your kernel again, try to configure X11, etc. etc.)

            Second: All the hardware necessary for an HDCP stripper is in the NeTV, but shipping it like that would be illegal. And shipping it without a non-infringing use would be illegal. But I've heard that you can download alternate firmware that makes the device more, or less, useful. Again, this is the Linux desktop solution. Some of us don't have that much free time.

            • Vitorio says:

              Oh, neat, this appears to be true.

              If you go to the "Requiem" Tor-based web site, there is indeed a file labeled as a firmware for the NeTV which claims to strip HDCP. http://tag3ulp55xczs3pn.onion.to/ will route you there not-through-Tor. It's at the bottom of the page. Flashing instructions look pretty simple, just an SSH into the box and some overwriting.

              Since you mentioned the PS3, which I think can do 60fps, the readme says "The NeTV, and thus the stripper, will only work for resolutions up to and including 720p60, 1080i60, or 1080p24. It will probably not work for 1080p60 or higher resolutions. The NeTV should negotiate transmitters down to a resolution it can handle."

  5. tkil says:

    In the great tradition of offering advice that I haven't tried myself, it seems that quite a few HDMI splitters / switches seem to strip off the HDCP bits:

    http://forum.videohelp.com/threads/334145-HDCP-strippers/page11

    Some are cheap enough to buy as throw-away experiments (25USD), others less so.

    Apparently some other widgets might also do the trick; it's hard to tell, since the users and the manufacturers have to be so circumspect:

    http://www.curtpalme.com/forum/viewtopic.php?p=359597#359597

  6. nwf says:

    It certainly appears possible to make one yourself, if I correctly read http://adamsblog.aperturelabs.com/2013/02/hdcp-is-dead-long-live-hdcp-peek-into.html . That said, it might still be more work than you'd like.

  7. Michael: What leads you to believe that will do the job?

  8. All edirol/roland HD video mixers are HDCP OK - available to rent at most A/V companies..

  9. Lots of reports on the internets.

  10. d says:

    This may be what you're looking for: http://www.tvone.com/1t-hdmidvi-main.shtml

  11. That's a distribution amplifier. My experience tells me that will not do the job. Even if that model is HDCP compliant, they are required to be smart enough to not pass the signal if the final display is not compliant.

  12. Andrew Stern says:

    Central on Howard & 4th has what you are looking for, or at least, they did a couple of months ago.

    It wasn't advertised very well, but boy does it work. There is a small caption on the box that says something along the lines of "hdmi decrypter."

    Located in the back of a shelf amongst the various splitters and hdmi matrix boxes underneath the cheap hd enclosures.

    $100 or less.

  13. someguy says:

    This little HDMI splitter box should do what you want, plus an HDMI to DVI-D cable/adapter.
    Forum posts here and here confirm the HDCP stripping function of the device.

    I know it doesn't say anything in the item description about removing HDCP from the stream, but vendors can't be explicit on this stuff or they suffer all sorts of DMCA wrath BS as HDFury did.

  14. Michael: I got one, and I'm not 100% sure, but let's say 90% sure that that thing does *not* send forged HDCP credentials. It will not cause a PS3 to talk to a 720p HDMI device that Apple TV will talk to. (I think that Apple TV only enforces HDCP when playing movies, but PS3 enforces it all the time.)

  15. Will Scullin says:

    You should really just switch back to analog RGB, it has a warmer tone.

  16. grェ says:

    I was trying to do the same thing, get HDCP free PS3 output for inputting into a capture card so I could play things on an rMBP. I picked up a box that took DVI-D (meaning I needed an HDMI->DVI cable as well) and optical TOSlink and re-injected the audio stream and spat out ostensibly HDCP free HDMI. It also took power; the entire thing did not work for said purpose, good luck finding one that does, people recommending products who haven't used them are pretty much worthless, but I can tell you this model (which was something someone had referenced as a working device, isn't): http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10114&cs_id=1011405&p_id=5369&seq=1&format=2