The official website for SSSS.GRIDMAN announced a list of guidelines for derivative works on November 1, apparently in response to questions about the staff’s policy.
The posted guidelines prohibit direct copying or tracing of any images, video, music, or writing from the anime.
Melonbooks, a retailer for dōjinshi (self-published works), posted a message on Tuesday to say that it will no longer stock works related to the SSSS.GRIDMAN anime as per the wishes of the copyright holders.
The store will remove SSSS.GRIDMAN works that it is already carrying.