Steve, you have gone in to much more detail (which is probably good) and I think you are right "on the money" making the distinction between IDX and other advertising.

Locally: Other agents are prohibited from advertising another brokers exclusive listing, UNLESS they have the written consent of both the listing broker and the seller. Further, other agents are prohibited from directly contacting the sellers of a listed property and all communications must be done through the listing broker.

Important Notice: This information is provided as basic educational information by the author and is not a substitute for the advice of an expert and/or the advice of a lawyer. There is NO representation as to legality, accuracy, correctness of the herein information and the reader is strongly urged to consult a lawyer in the relevant jurisdiction to ensure accuracy before acting on this information .