Here's what you need to do if you're interested in contributing to

Jane Street requires that all contributors of code or documentation to
Core complete, sign, and submit an [Individual Contributor License
Agreement]( The purpose of
this agreement is to clearly define the terms under which intellectual
property has been contributed to the Core and thereby allow us to
defend the project should there be a legal dispute regarding the
software, and to be flexible should licensing requirements change. A
signed CLA must be on file before an individual's contributions will
be accepted.

Corporations that have assigned employees to work on Core should
execute a [Corporate Contributor License
Agreement](, covering
intellectual property that may have been assigned as part of an
employment agreement. Individuals working for corporations that have
signed a CCLA still have to sign their own Individual CLA, to cover
any of their contributions which are not owned by their employer.

You can submit your CLA by:

- emailing a scan to
- or sending a fax to 917-746-6597