I had no Idea what you were talking about until I looked it up.

The Comics Code Authority (CCA) is part of the Comics Magazine Association of America (CMAA), and was created to regulate the content of comic books in the United States. Member publishers submit comic books to the CCA, which screens them for adherence to its Comics Code, and authorizes the use of their seal on the cover if the books comply. At the height of its influence, it was a de facto censor for the U.S. comic book industry.