dp619 writes "License-free software has become a thing. Only 14.9% of repositories on GitHub have a license, according to recent Software Freedom Law Center research. Red Monk has observed that this trend is occurring principally among younger software developers. Outercurve Foundation technical evangelist Eric Schultz has offered up his opinion, saying, 'As an active developer I want to add a slightly different perspective on the dangers of releasing unlicensed software. My perspective is based on a simple phrase: "Your License Is Your Interface."' He adds, 'A license similarly defines the interaction between the software, or more precisely the creators of the software, and users. Just like an interface, a license defines intended behavior of users of the software, such as the four essential freedoms or the ten pillars of the Open Source Definition. Just like an interface, a license prevents unintended behavior of users of the software, which depending on the open source license, may disclaim the original author of liability for use of the software, prohibit redistribution without recognizing the original author or prohibit distribution of derivatives under a more restrictive license. When it comes to legal use and distribution of your software, your license IS your interface.'"