3 ms·

Neat idea, but lack of HDCP support could be deal breaker for a lot of applications - I'd even consider listing this limitation nearer the top, it's currently a

by giobox 4y ago

Neat idea, but lack of HDCP support could be deal breaker for a lot of applications - I'd even consider listing this limitation nearer the top, it's currently at the end of a long README. HDCP is used in a huge number of HDMI devices.

js2 4y ago
You could combine with an HDFury device such as https://www.hdfury.com/product/dr-hdmi/ https://www.hdfury.com/product/dr-hdmi/ to fix that. Of course the HDFury device would have to be before the HDMI Firewall (closer to the source), so you have to trust the HDFury not to be hackable on its own.
jfim 4y ago
Is it used outside of playing DVDs and other copy protected content? It seems like the use case presented in the link (malicious presenter connecting a laptop that hacks the projector) would not need HDCP.
- api 4y ago
  Things like Netflix often query HDCP via browser extensions. There are workarounds but sometimes they won't play full screen without it. It's dumb though because it will usually play on DisplayPort which has nothing like HDCP.
  - happyopossum 4y ago
    That would fall under the ‘other’ playback GP mentioned. Still wouldn’t apply to a PowerPoint preso…
    - randombits0 4y ago
      Or could. With the push to “secure data”, DRMed internal docs already exist.
      - undersuit 4y ago
        OK but the analog hole on a Powerpoint slide is large enough that it's never going to get plugged. DRM kind of makes sense when there is 60 high resolution images a second, not when everyone has 5 minutes to jot down a single slide of text.
  - kllrnohj 4y ago
    DisplayPort has both it's own thing called DPCP but also as of displayport 1.1 it literally has HDCP, too. Which it has been tracking (so eg DP 1.3 has HDCP 2.2)
  - Mindwipe 4y ago
    > It's dumb though because it will usually play on DisplayPort which has nothing like HDCP. DisplayPort absolutely supports HDCP.
- vanchor3 4y ago
  > It seems like the use case presented in the link (malicious presenter connecting a laptop that hacks the projector) would not need HDCP. Unfortunately people often look at the projector and want to do something else with it, such as play video from one of the numerous sites that enforce DRM now, and will quickly become annoyed if they can't. It can go various different ways from here, but it usually ends up with firewall being removed one way or another because someone in the chain doesn't agree with or understand the importance of it.
  - jasomill 4y ago
    If you're not concerned about the risk of prosecution under the anti-circumvention provisions of the DMCA, you should be able to emulate HDCP 2.2 by connecting the computer to an HDCP 2.2-to-1.4 converter[1], connecting the converter to one of the myriad cheap HDCP 1.4 splitters or audio extractors that "accidentally" strips HDCP as a side effect, connecting the splitter to the firewall, and, finally, connecting the firewall to the monitor. [1] I've used both https://www.amazon.com/Monoprice-115242-Blackbird-HDCP-Converter/dp/B01CT7THLO/ref=sr_1_3?crid=1ZDK1HXNWPRG1&keywords=hdcp+2.2+converter&qid=1655871337&s=electronics&sprefix=hdcp+2.2+converter%2Celectronics%2C64&sr=1-3 https://www.amazon.com/Monoprice-115242-Blackbird-HDCP-Conve... and https://www.hdfury.com/product/vertex-4k60-444-600mhz/ https://www.hdfury.com/product/vertex-4k60-444-600mhz/ in similar scenarios, and both worked. Come to think of it, though, while I love my Vertex dearly, it's exactly the sort of highly programmable[2] device this firewall exists to protect against. [2] Over (out-of-band) USB, RS-232, and, using an optional external adapter, Bluetooth. AFAIK, it's at least not intentionally configurable or reprogrammable over HDMI.

by giobox 4y ago

js2 4y ago

You could combine with an HDFury device such as https://www.hdfury.com/product/dr-hdmi/ https://www.hdfury.com/product/dr-hdmi/ to fix that. Of course the HDFury device would have to be before the HDMI Firewall (closer to the source), so you have to trust the HDFury not to be hackable on its own.

jfim 4y ago

Is it used outside of playing DVDs and other copy protected content? It seems like the use case presented in the link (malicious presenter connecting a laptop that hacks the projector) would not need HDCP.

api 4y ago
Things like Netflix often query HDCP via browser extensions. There are workarounds but sometimes they won't play full screen without it. It's dumb though because it will usually play on DisplayPort which has nothing like HDCP.
- happyopossum 4y ago
  That would fall under the ‘other’ playback GP mentioned. Still wouldn’t apply to a PowerPoint preso…
  - randombits0 4y ago
    Or could. With the push to “secure data”, DRMed internal docs already exist.
    - undersuit 4y ago
      OK but the analog hole on a Powerpoint slide is large enough that it's never going to get plugged. DRM kind of makes sense when there is 60 high resolution images a second, not when everyone has 5 minutes to jot down a single slide of text.
- kllrnohj 4y ago
  DisplayPort has both it's own thing called DPCP but also as of displayport 1.1 it literally has HDCP, too. Which it has been tracking (so eg DP 1.3 has HDCP 2.2)
- Mindwipe 4y ago
  > It's dumb though because it will usually play on DisplayPort which has nothing like HDCP. DisplayPort absolutely supports HDCP.
vanchor3 4y ago
> It seems like the use case presented in the link (malicious presenter connecting a laptop that hacks the projector) would not need HDCP. Unfortunately people often look at the projector and want to do something else with it, such as play video from one of the numerous sites that enforce DRM now, and will quickly become annoyed if they can't. It can go various different ways from here, but it usually ends up with firewall being removed one way or another because someone in the chain doesn't agree with or understand the importance of it.
- jasomill 4y ago
  If you're not concerned about the risk of prosecution under the anti-circumvention provisions of the DMCA, you should be able to emulate HDCP 2.2 by connecting the computer to an HDCP 2.2-to-1.4 converter[1], connecting the converter to one of the myriad cheap HDCP 1.4 splitters or audio extractors that "accidentally" strips HDCP as a side effect, connecting the splitter to the firewall, and, finally, connecting the firewall to the monitor. [1] I've used both https://www.amazon.com/Monoprice-115242-Blackbird-HDCP-Converter/dp/B01CT7THLO/ref=sr_1_3?crid=1ZDK1HXNWPRG1&keywords=hdcp+2.2+converter&qid=1655871337&s=electronics&sprefix=hdcp+2.2+converter%2Celectronics%2C64&sr=1-3 https://www.amazon.com/Monoprice-115242-Blackbird-HDCP-Conve... and https://www.hdfury.com/product/vertex-4k60-444-600mhz/ https://www.hdfury.com/product/vertex-4k60-444-600mhz/ in similar scenarios, and both worked. Come to think of it, though, while I love my Vertex dearly, it's exactly the sort of highly programmable[2] device this firewall exists to protect against. [2] Over (out-of-band) USB, RS-232, and, using an optional external adapter, Bluetooth. AFAIK, it's at least not intentionally configurable or reprogrammable over HDMI.