The Dungeons & DragonsSystem Reference Document (SRD for short) is a critical part of the game's enormous popularity, allowing other companies and creators to make material that uses core aspects of the system without paying for licensing. D&D 5e's open-game license material has traditionally been laid out in SRD 5.1, but with the 2025 rules revisions, an updated document reflecting the changes was promised to follow up the core rulebooks. Although it didn't show up immediately after the Monster Manual, Wizards of the Coast finally revealed the SRD 5.2 release in April.