A method and apparatus for determining the scope of a content domain for ensuring that a content stream is not re-routed to an unauthorized display device. The apparatus includes a content source device, which supports multiple display outputs coupled to one or more content sink devices. A content source application generates and provides a content stream to a hardware interface which securely transmits the content stream to a protected content sink device using a content protection protocol. The content source application utilizes certain status information to ensure that the content stream is not re-routed to an unprotected or unapproved content sink device. The source application requests the updated session identification code from the transmitter/codec unit using the content protection protocol which is compared against the expected session identification code to ensure that the content display stream has not been re-routed to an unprotected content sink device.