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I don't know why Signal calls it "DRM" because the do not use DRM for this. Typically DRM means encryption & keys are involved (which is what Netflix & others a
by mmozeiko 1y ago
I don't know why Signal calls it "DRM" because the do not use DRM for this. Typically DRM means encryption & keys are involved (which is what Netflix & others are doing with Widevine or PlayReady).
All Signal does is just a simple Windows API call to exclude window from screen capture. SetWindowDisplayAffinity function with WDA_EXCLUDEFROMCAPTURE argument: https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setwindowdisplayaffinity https://learn.microsoft.com/en-us/windows/win32/api/winuser/...
- yupyupyups 1y agoThanks for the insight, I thought they took advantage of the whole DRM stack (including HDCP in monitors) to encrypt the UI and let the monitor decrypt it.
- k_roy 1y agoAnd Microsoft, literally call it the DRM flag. DRM doesn't insist on being encrypted. https://learn.microsoft.com/en-us/windows/client-management/manage-recall https://learn.microsoft.com/en-us/windows/client-management/... And that "simple Windows API" call is pretty much absolute, since it's across the stack.