The app marks content as protected
An app can restrict whether some or all of its visible content enters a screen-sharing stream.
Protected content
A black result can be expected
Protected content may appear black when an app prevents screen sharing.
What is happening
The system enforces that policy
The protected region or the entire shared frame may be delivered as black.
Dancer Mirror preserves the result
The product does not attempt to bypass or reconstruct protected pixels.
What to do next
Check whether other content is shareable
If only one app or region appears black, its sharing policy is the likely boundary. Repeated consent does not override that policy. On Android you can also fall back to a local movie in the practice player.