[bengarvey]

Hi, one of the co-founders here!

1. We didn't model it after a specific open source project, but Jake worked on https://www.singer.io. We do take inspiration from Open Source licenses like Apache 2, GPL, MIT, etc.

2. Open source in the sense that the terms of the contract are open source and released under a CCBY license. Terms are available via versioned URLs, github markdown source control, and maintained by a committee of contributors (attorneys).

2. Yes! You can find our REST API docs here: https://api.commonpaper.com/docs. It uses the JSONAPI spec.

3. We're currently integrated with Dropbox Sign.