CMS is using the Westhold transponder system, so whatever transponder you might find has to be compatible. The AMB transponders won't be compliant. If you have questions, call the office at 989-235-5200.
Simply put, it's a way to keep all of us happy. For years my photographers and I have struggled to educate our customers about US and International copyright laws. There are a large number of photographic print buyers that believe a couple of dollars paid to buy the print gives them the absolute right to scan that image and use it however they want. They take their scan to the local Walmart to make copies. They put the image on their web site without giving a photographers credit, even claiming the copyrights and their own. And a few (you KNOW who you are) have even offered bootleg copies for sale to others. To paraphrase an old commercial, "Got Brass?"