Current functionality is provided through ArcRelay Suite. Standalone distribution is still being validated; no separate download is promised.
Privacy: presentation protection
Choose applications whose visible windows should be covered, then toggle protection from the feature page or tray. Supported systems can also activate it when screen mirroring is detected. Select a frosted or solid cover and decide whether remote toggling is allowed.
Test the actual picture received by your meeting, mirroring or recording tool before relying on it for sensitive material. Window covering is not file encryption or a system lock, and does not protect against every capture method. Linux does not currently have native window detection and protection equivalent to macOS and Windows.
Boundaries
Window masking is not encryption or screen locking and cannot cover every capture method. Linux lacks equivalent native protection.