Playwrights Guild of Canada's core activity is a triennial contract with the Professional Association of Canadian Theatres. The foundation, and the reason that this contract and those standard agreements continue to hold any weight, is because of the copyright legislation that is currently enacted. We've been able to negotiate a royalty of 10% of the box office for any time that a play is produced on stage, which is envied by other countries.
On October 15th, 2018. See this statement in context.