Licensing
osr-editor's code is MIT licensed.
No game content in this package
osr-editor ships no game content. The Old-School Essentials SRD data — monsters, treasure types, the stocking tables — lives in osrlib, which includes the Open Game License and its attribution; the editor consumes that catalog through osrlib's own API and bundles none of it. The editor's test fixtures are original, synthetic material.
Your modules stay yours
Modules you author or convert are yours and stay in your project directories. No editor feature persists module content outside your project or workdir — the two exceptions are the ones you invoke explicitly: export to a path you choose, and publish to an osr-web checkout you configure. Conversion follows the same rule: forge's estimate and pipeline render pages into your destination workdir, never anywhere else.
Interoperated formats
The One Page Dungeon format and generator are Watabou's, read under their stated permissive terms ("You can use images created by the generator as you like: copy, modify, include in your commercial rpg adventures etc."). No generator code is vendored; the importer parses a local file you exported.