ruby License

For versions up to 1.9.2, the Ruby programming language was available under an explicit dual-licence scheme which allowed users to choose between a dedicated Ruby licence or the GNU General Public Licence v2 (GPLV2), which is one of the most common free software licences.

Starting at version 1.9.3, the dual-licensing clause changed to offer the choice of the FreeBSD License.

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 FreeBSD License, which is a non copyleft license.

The Ruby License is approved by the Free Software Foundation and is considered compatible with the GNU General Public License, due to its explicit dual-licensing clause.{{cite web|title=Various Licenses and Comments about Them|url=https://www.gnu.org/licenses/license-list.en.html#Ruby|publisher=GNU Foundation|language=en}}

The Open Source Initiative does not explicitly include the Ruby license as a certified an open source license; this is considered "unnecessary" due to the dual licensing clause.{{cite mailing list |url=http://lists.opensource.org/pipermail/license-discuss_lists.opensource.org/2002-February/004828.html |title=Ruby license |date=2002-02-03 |access-date=2020-05-17 |mailing-list=license-discuss |first=David |last=Johnson}}

In discussion over the change of the dual licensing clause on the debian-legal mailing list, it was noted that while the Ruby license itself is arguably not compatible with the Debian Free Software Guidelines, this is unimportant due to the dual-licensing clause.{{Cite web|url=https://lists.debian.org/debian-legal/2011/05/msg00018.html|title = Re: License check: Ruby 1.9.3}}

Software under Ruby license (including the older version when GPLv2 was a listed alternative Ruby 1.9.2 license) may be included in binary form within an Apache product if the inclusion is appropriately labeled.{{cite web|title=ASF Legal Previously Asked Questions|url=https://www.apache.org/legal/resolved.html#ruby-license|website=www.apache.org|language=en}}

Software other than the Ruby programming language itself which uses the Ruby License includes:

• JRuby, an implementation of Ruby atop the Java Virtual Machine
• MacRuby, an implementation of Ruby 1.9 directly on top of Mac OS X core technologies such as the Objective-C runtime and garbage collector, the LLVM compiler infrastructure and the Foundation and ICU frameworks. MacRuby contains code from the Ruby project {{cite web|title=MacRuby/MacRuby|url=https://github.com/MacRuby/MacRuby/blob/master/COPYING|website=GitHub|date=14 February 2022|language=en}} and the source code of the most MacRuby examples, unless specified, are covered by the Ruby license.{{cite web|title=MacRuby/MacRubySamples|url=https://github.com/MacRuby/MacRubySamples/blob/master/README.rdoc|website=GitHub|date=May 2021|language=en}}
• RubyGems, a package manager for Ruby
• IronRuby, an implementation of Ruby targeting the .NET Framework
• The JSON implementation for Ruby{{cite web|title=JSON implementation for Ruby|url=https://flori.github.io/json/|website=flori.github.io|language=en}}

{{refs}}

• [https://www.ruby-lang.org/en/about/license.txt Text] of the Ruby License

Category:Ruby (programming language)

Category:Free and open-source software licenses