Post Open (for Post Open Source) is a proposed successor to the Open Source software paradigm, originated by Bruce Perens, the creator of the Open Source Definition and co-founder of the Open Source Initiative. It is promoted at the web site PostOpen.org
Post open source, also called "post open-source software (POSS)", was a 2012/2013 noticed movement among software developers, in particular open-source software developers. The interpretation was that this was a reaction to the complex compliance requirements of the software license/permission culture, noticed by more code being posted into repositories without any license whatsoever, implying a disregard for the current license regimes, including copyleft as supporter of the current copyright system ("Copyright reform movement").