Logback License
Logback source code and binaries are distributed under the GNU Lesser General Public License as published by the Free Software Foundation.
Logback: the reliable, generic, fast and flexible logging library for Java. Copyright (C) 2000-2006, QOS.ch This library is free software, you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation.
Please note that logback is intended to be used behind the SLF4J API, which is licensed under an X11 type license.
If you wish to make a significant contribution to the logback project, we invite you to file Contributor License Agreement. The purpose of this agreement is to formalize the terms of your contribution and to protect the project in case of litigation.