Drag/drop is much more than creating a compendium. Not only does the compendium need to be constructed in a certain way, but the character sheet needs a ton of scripting to allow it to accept and apply the content from the compendium. Just as an example, the publicly available code (html file) for the 5E D&D sheet is mostly javascript sheetworkers. If I remember right, only about 1/4 of that file is actually the html. The rest is sheetworkers, most of which deal with charactermancer stuff (which is just a fancy way to apply compendium info to the sheet). This amount of automation would require licensing agreements between the publisher and Roll20 for sure, and the technical knowledge to get it all set up. There is a suggestion going for custom compendiums, but it sounds like they have some back end code work to do before they get working on something that works in individual games instead of for creating a compendium for a publisher. The last dev comment also makes clear that it is very unlikely for custom compendiums to include drag/drop functionality, at least at the beginning. <a href="https://app.roll20.net/forum/post/2940484/custom-compendium" rel="nofollow">https://app.roll20.net/forum/post/2940484/custom-compendium</a> If you just want the info in your game, the original form of compendium is the handout system. Some of the older modules that were created before the compendium system have all their info on handouts and character sheets, with no compendium tab info at all. When you go about it that way, it is (as far as I know) fair use as if you were sharing your books around a physical game table, because it isn't something you can easily publicly share outside the game. You can make use of the the ability to link handouts and sheets to create index handouts and archive everything that doesn't need to be visible all the time, since they will still be called up to view from a link when archived. If you set up a base game with all the content you desire for a specific game system, then you can just copy that game when you start something new. It takes some time, but you only need to put in all that time once if you create a template game. An example of a table of contents handout and some of what is actually showing in folders in the journal in my Palladium Fantasy 1E game (out of print since '94, so will definitely never have a compendium). I have pretty much the entire rule set created, so every skill, spell, class, race, magic item, etc. is in there somewhere. Due to using the links, there are currently 1230 archived handouts, and there will probably be 1235 to 1240 by the time I start another game as I find a few odds and ends I want included.