Production Maestro is provided with a 31 day initial demo/trial after which a license must be purchased to continue running Production Maestro. 
The production maestro work screen will keep a running record of days remaining at the top of the screen.  If the user is running multiple intelligently linked frames then each frame will require a separate license, in order for the factory to generate a 16 character passcode the frame dongle ID# will be needed for each frame requiring a license key. 
Once the license keys are obtained from the factory they will need to be entered into the ECS 5.1 software via the System Preferences / System Access Codes work screen and the downloaded to the frame(s).
Production Maestro will check the license on the connected matrix or matrices repeatedly during operation.  If the matrix license ceases to be available Production Maestro will disconnect from the matrix. 
There two different licensing options Production Maestro - standard version (http://www.clearcom.com/product/digital-matrix/software/production-maestro)Production Maestro - Pro version (http://www.clearcom.com/product/digital-matrix/software/production-maestro-pro)