It's complicated, but in brief: There's no copyright violation possible when sharing macros : rules as listed in game books are not copyrighted, only the specific expression of them is copyrighted, When you put some rule in a macro, you have changed the wording, so it's not covered by copyright anymore. If you copy huge chunks of gamebooks, put them in handouts, and then were able to share them, that would technically violate copyright. But most people aren't going to be copying huge chunks - if players are copying descriptive text for handouts, the sort of description that you read out when pcs enter a new room, or decsriptions of NPCs, few game publishers will object to this level of use. It's pretty much the same level of use that already happens on fan sites and helps advertise the game, and is easily arguable that it fits within the intended use of the module. If you do large scale copying (like trying to reproduce an entire module in roll20, and then roll20 introduced a sharing feature that allowed everyone using roll20 to download it, that would constitute a strong copyright violation. BUT roll20 could easily avoid liability, by doing the same thing youtube and other content sharing sites do: take advantage of the Safe Harbour Provisions of the DMCA: as long as they include a mechanism for copyright owners to contact them, request a take down of violating material, and have a procedure for following through on that, then roll20 can legally make available whatever sharing facilities their users are asking for.