[k__]

Which DRM solutions like TEE and FHE are, so I don't see the issue.

[debugnik]

The "DRM" used here by Signal is just a Win32 function that keeps a window out of screen capture, not an anti-tamper software nor a protected media path.

[k__]

Fair.

But it seems to me that's a step in the right direction, even if it doesn't go far enough.