Any resources on Level 1 decryption?

gruez · on Nov 13, 2020

One method appears to be playing back on a legitimate player, then using HDCP strippers on hdmi/displayport outputs[1]. I've seen some 4k releases that clearly show the streaming site's playback controls, for instance.

[1] search for "hdcp bypass" on ebay

_vbdg · on Nov 13, 2020

I remember cheap chinese hdmi splitters used to inadvertently strip hdcp; is that still current?

dannyw · on Nov 13, 2020

Yes, but you could just explicitly search for a hdcp stripper and it'll work.

snvzz · on Nov 13, 2020

Capture HDMI. Strip DHCP.

Refer to the perfectly legal NeTV2 + trivial modification if you understand the HDL.

Thorrez · on Nov 13, 2020

Is that considered decryption? Wouldn't that both decrypt and decompress? What if someone wants the original compressed stream so the video doesn't need to be re-compressed?

bscphil · on Nov 13, 2020

That can't be done without hardware hacks, which can (often) be traced to isolated hardware which the manufacturers will then lock out or force a software upgrade for, making it impossible to use in the future. That's why most 4k pirate releases are re-encoded from HDMI, not lossless rips of the original stream as they are for 720p and 1080p.

matheusmoreira · on Nov 13, 2020

Will that reduce the quality of the audio/video?

bawolff · on Nov 13, 2020

There have been a bunch of papers recently about using undervolting to break secure enclaves. No idea about how applicable that is, but that might be a possible attack vector.

m-p-3 · on Nov 13, 2020

It's probably kept under wraps by large scene groups, they don't want to show their methods and have them patched out.