4 ms·
Would be pretty clever if Zoom disguised the audio watermarking as the kind of distortion you get when someone's audio / video is laggy and turns into a choppy
by supernova87a 6y ago
Would be pretty clever if Zoom disguised the audio watermarking as the kind of distortion you get when someone's audio / video is laggy and turns into a choppy mess for a fraction of a second. You wouldn't suspect it unless you knew!
- netsharc 6y agoThey could do a lot of clever stuff, maybe a different compression ratio for each participant. Even the arangement of the participants thumbnails on the screen, if I were working on the "leaks mitigation" team I would suggest the server to store the arrangement per user, and if the user switches the faces around on the client app, to also record that order!
- angry_octet 6y agoThey could easily jitter audio/video frame delay, or the codec noise in the video (main and delta frames, quantization, colour gamut) per receiver. If it is sharing a document view it could jitter the pixel colour (like a printer dither) or the position of characters. It's basically impossible to be sure, though if you had multiple endpoint recordings you could probably identify likely deltas. Examining the state of the zoom client might also be useful, because it is free to do this client side. Unless the IDs are cryptographically generated server side, you could tweak the client side to show someone else's client ID.
- dexterdog 6y ago> if you had multiple endpoint recordings you could probably identify likely deltas. I would think this to be the case of blurring the watermarks in a video feed, but since every zoom feed on a single is so different that might not work. Most of the deltas are not intentional.
- angry_octet 6y agoYes it would be hard. At best you could put a ceiling on the bitrate and increase the complexity of the decoder.