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Software Licenses
Books
Open Source
Glossary
Advertising Clause
Compatible Licenses
Copyleft
Derivative Works
Dual Licensing
FLOSS
FOSS
Free Software
Incompatible Licenses
OSD
OSI Certified
OSS
Permissive Licenses
Viral Licenses
Licenses
AGPL
Apache
Apple
Artistic
BSD
CDDL
CPL
EPL
GPL v2
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IPL
LGPL
MIT
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SPL
X License
X11 License
Organizations
ASF
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OSI
SFLC
People
Bruce Perens
Eben Moglen
Eric Raymond
Lawrence Lessig
Linus Torvalds
Richard Stallman
Proprietary
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MS Community License
MS Permissive License
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Dual Licensing
Dual Licensing is the practice of distributing a particular piece of
software under more than once license agreement, giving recipient's
a choice of which agreement they wish to license the software under.
In some cases a copyright-holder or distributor may offer a choice of
more than two licenses, and this is usually described as
"tri-licensing" or "multi-licensing".
Perhaps the most common form of dual licensing is when a software
vendor offers their software under both an
open-source
copyleft license,
and a
proprietary license. This allows
licensees wanting to prepare
derivative works
a choice of distributing such works also under a
copyleft license, or paying
a fee if they wish to distribute their
derivative works
under a
proprietary license.
Examples of software which use dual licensing of this type, include
Qt by TrollTech,
and
MySQL.
Another reason why software may be dual licensed, is because of
license
compatibility
issues. For example, if a copyright-holders wants to make his software
available to a wide range of Open-Source projects, he may dual license
(or multi-license) his software, allowing many different projects to use,
modify and distribute it.
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