|Publisher||Yukihiro Matsumoto, et al.|
|Linking from code with a different license||Yes|
The Ruby License is a license applied to the Ruby programming language and also available to be used in other projects. It is approved by the Free Software Foundation although it has not been reviewed (approved Open Source) by the Open Source Initiative.
The Ruby License has unusual copyleft requirements, stating that redistributions should not necessarily be under the terms of the Ruby license, but placed "in the Public Domain or otherwise ... Freely Available". For example, a modified form of a program licensed under the Ruby license may be placed under the GNU General Public License or Common Development and Distribution License, which, while still free software licenses, are incompatible with each other, but it may not be redistributed as a proprietary application.
For Ruby versions up to 1.9.2, it included an explicit dual-licensing clause that allowed covered software to be distributed under the terms of the GPL instead of those of the Ruby License itself. For versions since 1.9.2, starting with 1.9.3, the reference implementation of Ruby has used a version of the Ruby License that includes an explicit dual-licensing clause that allows covered software to be distributed under the terms of the Simplified BSD License instead.
- "Debian - License information". Debian Foundation. Archived from the original on 2013-04-01. Retrieved 2013-11-09.
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