Reciprocal Public License
The Reciprocal Public License (RPL) is a copyleft software license released in 2001. Version 1.5 of the license was published on July 15, 2007, and was approved by the Open Source Initiative as an open-source license.
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The RPL was inspired by the GNU General Public License (GPL) and authored to explicitly remove what the RPL's authors have referred to as the GPL's "privacy loophole". The GPL privacy loopholes allows recipients of GPL'd code to:
- make changes to source code which are never released to the open source community (by virtue of not deploying "to a third party"), and
- derive financial or other business benefit from that action, violating what some might consider a simple concept of "fairness".
Because of its "viral" nature, the RPL is often found in dual-licensing models in which it is paired with more traditional closed-source licenses. This strategy allows software companies who use this model to present customers with a "pay with cash or pay with code" option, ensuring either the growth of the software directly through code contributions or indirectly through cash which can be used to fund further development.
The RPL was written to conform to the requirements of the Open Source Initiative to ensure that it met the goals for an Open Source license and is an approved open-source license. However, because of its requirements for reciprocation without exceptions, it is considered to be non-free by the Free Software Foundation. The license is used by Active Agenda, a risk-management web application, and NServiceBus, an asynchronous messaging library for the .NET/Mono platform.
- "Reciprocal Public License Version 1.0, December 21, 2001". Technical Pursuit Inc. Archived from the original on 2002-02-23.
- Edney, William J. (2007-07-24). "For Approval: Reciprocal Public License 1.5 (upgrade)". license-discuss (Mailing list).
- "Licenses by Name". Open Source Initiative. Retrieved 2016-11-27.
- "RPL". Free Software Foundation.
- license on github "Your license to the NServiceBus source and/or binaries is governed by the Reciprocal Public License 1.5"
- The Reciprocal Public License 1.5 hosted by the Open Source Initiative
- The Reciprocal Public License 1.3 hosted by Technical Pursuit Inc. (archived link)
- The Reciprocal Public License 1.1 hosted by the Open Source Initiative
- The Reciprocal Public License 1.0 hosted by Technical Pursuit Inc. (archived link)