I've read the rules for creating marketplace content here and here . I'm curious if our purchase of the D&D 5E Monster Manual and Player's Handbook (or other books) on Roll20 includes the rights to distribute that content as part of a Roll20 module? For example, am I free to add creatures to the module/adventure that are available in the Monster Manual but not already made available by the OGL in the D&D 5E SRD? Also, will this require purchasers of my module/adventure to also purchase the Monster Manual? If this question has already been asked and answered, I apologize. My search of the marketplace help center articles and this forum didn't turn up any explicit answers.