Sialk Player is free within three files in a playlist, and everything it does works within them. The cap refuses additions and never cuts what a room already has, so nothing running is ever darkened.
A room that pays, an organisation, a wall that is part of something people pay to see or a client pays for, buys the player once. Pricing says what that means and what it costs, which is proposed until 1.0.
In the beta
There is nothing to paste yet: the licence pane stays out of sight until 1.0, when a key from your email lifts the cap. A key is checked on this Mac and never over the network. A show is never interrupted for a licence, and nothing about one can darken a wall.