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{{short description|source-available software licensing scheme by Microsoft}}
{{Short description|Source-available software licensing scheme by Microsoft}}
The '''Shared Source Initiative''' ('''SSI''') is a [[Source-available software|source-available]] [[Software license|software licensing]] scheme launched by [[Microsoft]] in May 2001.<ref>{{cite web|url=http://www.geekzone.co.nz/content.asp?contentid=4253|title=Microsoft announces expansion of Shared Source Initiative|publisher=}}</ref> The program includes a spectrum of technologies and licenses, and most of its source code offerings are available for download after eligibility criteria are met.<ref>{{cite web|url=https://cyber.harvard.edu/ilaw/brazil03/ms.html|title=Microsoft Shared Source Initiative|website=Berkman Klein Center|accessdate=24 Aug 2018}}</ref>
The '''Shared Source Initiative''' ('''SSI''') is a [[Source-available software|source-available]] [[Software license|software licensing]] scheme launched by [[Microsoft]] in May 2001.<ref>{{cite web|url=http://www.geekzone.co.nz/content.asp?contentid=4253|title=Microsoft announces expansion of Shared Source Initiative}}</ref> The program includes a spectrum of technologies and licenses, and most of its source code offerings are available for download after eligibility criteria are met.<ref>{{cite web|url=https://cyber.harvard.edu/ilaw/brazil03/ms.html|title=Microsoft Shared Source Initiative|website=Berkman Klein Center|access-date=24 Aug 2018}}</ref>


== Overview ==
== Overview ==

Microsoft's Shared Source Initiative allows individuals and organizations to access Microsoft's source code for reference (e.g. when developing complementary systems), for review and auditing from a security perspective (mostly wanted by some large corporations and governments), and for development (academic institutions, OEMs, individual developers).
Microsoft's Shared Source Initiative allows individuals and organizations to access Microsoft's source code for reference (e.g. when developing complementary systems), for review and auditing from a security perspective (mostly wanted by some large corporations and governments), and for development (academic institutions, OEMs, individual developers).


As part of the framework, Microsoft released 5 licenses for general use. Two of them, [[Microsoft Public License]] and [[Microsoft Reciprocal License]], have been approved by the [[Open Source Initiative]] as [[open source license]]s<ref>{{cite web|url=http://opensource.org/licenses/ms-pl.html|title=Microsoft Public License (MS-PL) – Open Source Initiative|website=opensource.org}}</ref><ref>{{cite web|url=http://opensource.org/licenses/ms-rl.html|title=Microsoft Reciprocal License (MS-RL) – Open Source Initiative|website=opensource.org}}</ref> and are regarded by the [[Free Software Foundation]] as [[free software]] licenses.<ref name="FSFLicenseList">{{cite web|url=https://www.gnu.org/licenses/license-list.html|title=Various Licenses and Comments about Them|website=GNU Operating System|publisher=Free Software Foundation|accessdate=23 Jul 2018}}</ref> Other shared source licenses are proprietary, and thus allow the copyright holder to retain tighter control over the use of their product.
As part of the framework, Microsoft released 5 licenses for general use. Two of them, [[Microsoft Public License]] and [[Microsoft Reciprocal License]], have been approved by the [[Open Source Initiative]] as [[open source license]]s<ref>{{cite web|url=http://opensource.org/licenses/ms-pl.html|title=Microsoft Public License (MS-PL) – Open Source Initiative|website=opensource.org}}</ref><ref>{{cite web|url=http://opensource.org/licenses/ms-rl.html|title=Microsoft Reciprocal License (MS-RL) – Open Source Initiative|website=opensource.org}}</ref> and are regarded by the [[Free Software Foundation]] as [[free software]] licenses.<ref name="FSFLicenseList">{{cite web|url=https://www.gnu.org/licenses/license-list.html|title=Various Licenses and Comments about Them|website=GNU Operating System|publisher=Free Software Foundation|access-date=23 Jul 2018}}</ref> Other shared source licenses are proprietary, and thus allow the copyright holder to retain tighter control over the use of their product.


Microsoft's Shared Source Initiative has been imitated by other companies such as [[RISC OS Open Ltd]].<ref>{{cite web|url=http://www.riscosopen.org/|title=RISC OS Open: Welcome|website=www.riscosopen.org}}</ref>
Microsoft's Shared Source Initiative has been imitated by other companies such as [[RISC OS Open Ltd]].<ref>{{cite web|url=http://www.riscosopen.org/|title=RISC OS Open: Welcome|website=www.riscosopen.org}}</ref>
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| title = Shared Source Common Language Infrastructure License
| title = Shared Source Common Language Infrastructure License
| url = http://msdn.microsoft.com/MSDN-FILES/027/002/097/ShSourceCLILicense.htm
| url = http://msdn.microsoft.com/MSDN-FILES/027/002/097/ShSourceCLILicense.htm
}}</ref> and the Microsoft [[Windows CE|Windows Embedded CE]] 6.0 Shared Source License.<ref>{{cite web|url=http://msdn2.microsoft.com/en-us/embedded/bb190212.aspx|title=Windows Embedded|first=|last=Archiveddocs|website=msdn2.microsoft.com}}</ref>
}}</ref> and the Microsoft [[Windows CE|Windows Embedded CE]] 6.0 Shared Source License.<ref>{{cite web|url=http://msdn2.microsoft.com/en-us/embedded/bb190212.aspx|title=Windows Embedded|last=Archiveddocs|website=msdn2.microsoft.com}}</ref>


==Free and open-source licenses==
==Free and open-source licenses==
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This is the least restrictive of the Microsoft licenses and allows for distribution of ''compiled'' code for either commercial or non-commercial purposes under any license that complies with the Ms-PL. Redistribution of the source code itself is permitted only under the Ms-PL.<ref name="ms-pl">{{cite web
This is the least restrictive of the Microsoft licenses and allows for distribution of ''compiled'' code for either commercial or non-commercial purposes under any license that complies with the Ms-PL. Redistribution of the source code itself is permitted only under the Ms-PL.<ref name="ms-pl">{{cite web
| title = Microsoft Public License (Ms-PL)
| title = Microsoft Public License (Ms-PL)
| website = [[Microsoft]]
| url = http://www.microsoft.com/opensource/licenses.mspx#Ms-PL
| url = http://www.microsoft.com/opensource/licenses.mspx#Ms-PL
}}</ref> Initially titled ''Microsoft Permissive License'', it was renamed to ''Microsoft Public License'' while being reviewed for approval by the [[Open Source Initiative]] (OSI).<ref>{{cite web|last1=Foley|first1=Mary|title=Microsoft gets the open-source licensing nod from the OSI|url=http://www.zdnet.com/article/microsoft-gets-the-open-source-licensing-nod-from-the-osi/|website=ZDNet|accessdate=22 May 2015}}</ref> The license was approved on October 12, 2007, along with the Ms-RL.<ref name="osi-approval">{{cite web
}}</ref> Initially titled ''Microsoft Permissive License'', it was renamed to ''Microsoft Public License'' while being reviewed for approval by the [[Open Source Initiative]] (OSI).<ref>{{cite web|last1=Foley|first1=Mary|title=Microsoft gets the open-source licensing nod from the OSI|url=https://www.zdnet.com/article/microsoft-gets-the-open-source-licensing-nod-from-the-osi/|website=ZDNet|access-date=22 May 2015}}</ref> The license was approved on October 12, 2007, along with the Ms-RL.<ref name="osi-approval">{{cite web
| title = OSI Approves Microsoft License Submissions| url = http://opensource.org/node/207| date = 2007-10-17 |accessdate=2013-08-08|quote=''Acting on the advice of the License Approval Chair, the OSI Board today approved the Microsoft Public License (Ms-PL) and the Microsoft Reciprocal License (Ms-RL). The decision to approve was informed by the overwhelming (though not unanimous) consensus from the open source community that these licenses satisfied the 10 criteria of the Open Source definition, and should therefore be approved.''}}</ref>
| title = OSI Approves Microsoft License Submissions| url = http://opensource.org/node/207| date = 2007-10-17 |access-date=2013-08-08|quote=''Acting on the advice of the License Approval Chair, the OSI Board today approved the Microsoft Public License (Ms-PL) and the Microsoft Reciprocal License (Ms-RL). The decision to approve was informed by the overwhelming (though not unanimous) consensus from the open source community that these licenses satisfied the 10 criteria of the Open Source definition, and should therefore be approved.''}}</ref>
According to the Free Software Foundation, it is a free software license but not compatible with the [[GNU GPL]].<ref name="FSFLicenseList"/>. Ms-PL provides a free and flexible licensing for developers using source codes under this license .
According to the Free Software Foundation, it is a free software license but not compatible with the [[GNU GPL]].<ref name="FSFLicenseList"/> Ms-PL provides a free and flexible licensing for developers using source codes under this license. However, the Ms-PL is a [[copyleft]] license because it requires the source code of software it governs to be distributed only under the same license (the Ms-PL).<ref>{{Cite web|title=Microsoft Public License (MS-PL) {{!}} Open Source Initiative|url=https://opensource.org/licenses/MS-PL|access-date=2020-08-28|website=opensource.org}}</ref>


=== {{anchor|Microsoft Reciprocal License}} Microsoft Reciprocal License (Ms-RL) ===
=== {{anchor|Microsoft Reciprocal License}} Microsoft Reciprocal License (Ms-RL) ===
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|url=http://www.microsoft.com/opensource/licenses.mspx#Ms-RL
|url=http://www.microsoft.com/opensource/licenses.mspx#Ms-RL
|title=Microsoft Reciprocal License (Ms-RL)
|title=Microsoft Reciprocal License (Ms-RL)
|website=[[Microsoft]]
}}</ref> The Ms-RL allows those files in the distribution that do not contain code originally licensed under Ms-RL to be licensed according to the copyright holder's choosing. This is similar, but not the same as the [[CDDL]], [[Eclipse Public License|EPL]] or [[LGPL]] (GPL with a typical "linking exception").{{Citation needed|date=March 2008}} Initially known as the ''Microsoft Community License'', it was renamed during the OSI approval process.
}}</ref> The Ms-RL allows those files in the distribution that do not contain code originally licensed under Ms-RL to be licensed according to the copyright holder's choosing. This is similar, but not the same as the [[CDDL]], [[Eclipse Public License|EPL]] or [[LGPL]] (GPL with a typical "linking exception").{{Citation needed|date=March 2008}} Initially known as the ''Microsoft Community License'', it was renamed during the OSI approval process.


Line 64: Line 65:
|url=http://www.microsoft.com/resources/sharedsource/licensingbasics/limitedpubliclicense.mspx
|url=http://www.microsoft.com/resources/sharedsource/licensingbasics/limitedpubliclicense.mspx
|title=Microsoft Limited Public License (Ms-LPL)
|title=Microsoft Limited Public License (Ms-LPL)
|website=[[Microsoft]]
}}</ref> This license is not open source, as defined by the [[Open Source Initiative|OSI]], because the restriction limiting use of the software to Windows violates the stipulation that open-source licenses must be technology-neutral.<ref name="OSD">{{cite web
}}</ref> This license is not open source, as defined by the [[Open Source Initiative|OSI]], because the restriction limiting use of the software to Windows violates the stipulation that open-source licenses must be technology-neutral.<ref name="OSD">{{cite web
|url=http://www.opensource.org/docs/osd
|url=http://www.opensource.org/docs/osd
Line 75: Line 77:
|url=http://www.microsoft.com/resources/sharedsource/licensingbasics/limitedreciprocallicense.mspx
|url=http://www.microsoft.com/resources/sharedsource/licensingbasics/limitedreciprocallicense.mspx
|title=Microsoft Limited Reciprocal License (Ms-LRL)
|title=Microsoft Limited Reciprocal License (Ms-LRL)
|website=[[Microsoft]]
}}</ref> Like the Ms-LPL, this license is not open source because it is not technology-neutral<ref name="OSD" /> due to its restriction that licensed software must be used on Windows, and is also not considered free by the Free Software Foundation due to this restriction.<ref name="FSFLicenseList" />
}}</ref> Like the Ms-LPL, this license is not open source because it is not technology-neutral<ref name="OSD" /> due to its restriction that licensed software must be used on Windows, and is also not considered free by the Free Software Foundation due to this restriction.<ref name="FSFLicenseList" />


Line 85: Line 88:
| date=2016-07-06
| date=2016-07-06
| quote=''"Reference use" means use of the software within your company as a reference, in read only form, for the sole purposes of debugging your products, maintaining your products, or enhancing the interoperability of your products with the software, and specifically excludes the right to distribute the software outside of your company.''
| quote=''"Reference use" means use of the software within your company as a reference, in read only form, for the sole purposes of debugging your products, maintaining your products, or enhancing the interoperability of your products with the software, and specifically excludes the right to distribute the software outside of your company.''
| accessdate=2016-07-06}}</ref> Developers may not distribute or modify the code for commercial or non-commercial purposes.<ref>{{cite web
| access-date=2016-07-06}}</ref> Developers may not distribute or modify the code for commercial or non-commercial purposes.<ref>{{cite web
|url=http://referencesource.microsoft.com/license.html
|url=http://referencesource.microsoft.com/license.html
|title=Microsoft Reference Source License
|title=Microsoft Reference Source License
}}</ref> The license has previously been abbreviated ''Ms-RL'', but ''Ms-RL'' now refers to the ''Microsoft Reciprocal License''.<ref name="ms-rl">{{cite web
}}</ref> The license has previously been abbreviated ''Ms-RL'', but ''Ms-RL'' now refers to the ''Microsoft Reciprocal License''.<ref name="ms-rl"/>
|url=http://www.microsoft.com/opensource/licenses.mspx#Ms-RL
|title=Microsoft Reciprocal License (Ms-RL)
}}</ref>


==Criticism==
==Criticism==
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|url=http://opensource.org/node/225
|url=http://opensource.org/node/225
|title=Who Is Behind "Shared Source" Misinformation Campaign?
|title=Who Is Behind "Shared Source" Misinformation Campaign?
|author=[[Michael Tiemann]]
|author=Michael Tiemann
|author-link=Michael Tiemann
|date=2007-11-11
|date=2007-11-11
|accessdate=2011-03-12
|access-date=2011-03-12
|quote=''Shared source is a marketing term created and controlled by Microsoft. Shared source is not open source by another name. Shared source is an insurgent term that distracts and dilutes the Open Source message by using similar-sounding terms and offering similar-sounding promises. And to date, 'shared source' has been a marketing dud as far as Open Source is concerned.''}}</ref>
|quote=''Shared source is a marketing term created and controlled by Microsoft. Shared source is not open source by another name. Shared source is an insurgent term that distracts and dilutes the Open Source message by using similar-sounding terms and offering similar-sounding promises. And to date, 'shared source' has been a marketing dud as far as Open Source is concerned.''}}</ref>

The Shared Source Initiative has also been noted to increase the problem of [[license proliferation]].<ref>[https://arstechnica.com/information-technology/2007/08/evaluating-microsofts-shared-source-licenses/ Evaluating Microsoft’s Shared Source licenses] Ars Technica, 2007</ref>


== See also ==
== See also ==
Line 109: Line 112:


== References ==
== References ==
{{reflist}}
{{Reflist}}


== External links ==
== External links ==
Line 115: Line 118:


{{Microsoft}}
{{Microsoft}}
{{Microsoft FOSS}}
{{FOSS}}
{{FOSS}}


[[Category:Microsoft initiatives]]
[[Category:Microsoft initiatives]]
[[Category:Software licenses]]
[[Category:Software licensing]]

Latest revision as of 17:21, 15 November 2024

The Shared Source Initiative (SSI) is a source-available software licensing scheme launched by Microsoft in May 2001.[1] The program includes a spectrum of technologies and licenses, and most of its source code offerings are available for download after eligibility criteria are met.[2]

Overview

[edit]

Microsoft's Shared Source Initiative allows individuals and organizations to access Microsoft's source code for reference (e.g. when developing complementary systems), for review and auditing from a security perspective (mostly wanted by some large corporations and governments), and for development (academic institutions, OEMs, individual developers).

As part of the framework, Microsoft released 5 licenses for general use. Two of them, Microsoft Public License and Microsoft Reciprocal License, have been approved by the Open Source Initiative as open source licenses[3][4] and are regarded by the Free Software Foundation as free software licenses.[5] Other shared source licenses are proprietary, and thus allow the copyright holder to retain tighter control over the use of their product.

Microsoft's Shared Source Initiative has been imitated by other companies such as RISC OS Open Ltd.[6]

Microsoft also uses specific licenses for some of their products, such as the Shared Source CLI License[7] and the Microsoft Windows Embedded CE 6.0 Shared Source License.[8]

Free and open-source licenses

[edit]

The following licenses are considered open-source by the Open Source Initiative and free by the Free Software Foundation.

Microsoft Public License (Ms-PL)

[edit]

This is the least restrictive of the Microsoft licenses and allows for distribution of compiled code for either commercial or non-commercial purposes under any license that complies with the Ms-PL. Redistribution of the source code itself is permitted only under the Ms-PL.[9] Initially titled Microsoft Permissive License, it was renamed to Microsoft Public License while being reviewed for approval by the Open Source Initiative (OSI).[10] The license was approved on October 12, 2007, along with the Ms-RL.[11] According to the Free Software Foundation, it is a free software license but not compatible with the GNU GPL.[5] Ms-PL provides a free and flexible licensing for developers using source codes under this license. However, the Ms-PL is a copyleft license because it requires the source code of software it governs to be distributed only under the same license (the Ms-PL).[12]

Microsoft Reciprocal License (Ms-RL)

[edit]

This Microsoft license allows for distribution of derived code so long as the modified source files are included and retain the Ms-RL.[13] The Ms-RL allows those files in the distribution that do not contain code originally licensed under Ms-RL to be licensed according to the copyright holder's choosing. This is similar, but not the same as the CDDL, EPL or LGPL (GPL with a typical "linking exception").[citation needed] Initially known as the Microsoft Community License, it was renamed during the OSI approval process.

On December 9, 2005, the Ms-RL license was submitted to the Open Source Initiative for approval by John Cowan.[14] OSI then contacted Microsoft and asked if they wanted OSI to proceed. Microsoft replied that they did not wish to be reactive and that they needed time to review such a decision.[15]

At the O'Reilly Open Source Convention in July 2007, Bill Hilf, director of Microsoft's work with open source projects, announced that Microsoft had formally submitted Ms-PL and Ms-RL to OSI for approval.[16] It was approved on October 12, 2007, along with the Ms-PL.[11] According to the Free Software Foundation, it is a free software license but not compatible with the GNU GPL.[5]

Restricted licenses

[edit]

The following source-available software licenses have limitations that prevent them from being open-source according to the Open Source Initiative and free to the Free Software Foundation.

Microsoft Limited Public License (Ms-LPL)

[edit]

This is a version of the Microsoft Public License in which rights are only granted to developers of Microsoft Windows-based software.[17] This license is not open source, as defined by the OSI, because the restriction limiting use of the software to Windows violates the stipulation that open-source licenses must be technology-neutral.[18] It is also considered to be non-free by the Free Software Foundation due to this restriction.[5]

Microsoft Limited Reciprocal License (Ms-LRL)

[edit]

This is a version of the Microsoft Reciprocal License in which rights are only granted when developing software for a Microsoft Windows platform.[19] Like the Ms-LPL, this license is not open source because it is not technology-neutral[18] due to its restriction that licensed software must be used on Windows, and is also not considered free by the Free Software Foundation due to this restriction.[5]

Microsoft Reference Source License (Ms-RSL)

[edit]

This is the most restrictive of the Microsoft Shared Source licenses. The source code is made available to view for reference purposes only, mainly to be able to view Microsoft classes source code while debugging.[20] Developers may not distribute or modify the code for commercial or non-commercial purposes.[21] The license has previously been abbreviated Ms-RL, but Ms-RL now refers to the Microsoft Reciprocal License.[13]

Criticism

[edit]

Two specific shared source licenses are interpreted as free software and open source licenses by FSF and OSI. However, former OSI president Michael Tiemann considers the phrase "Shared Source" itself to be a marketing term created by Microsoft. He argues that it is "an insurgent term that distracts and dilutes the Open Source message by using similar-sounding terms and offering similar-sounding promises".[22]

The Shared Source Initiative has also been noted to increase the problem of license proliferation.[23]

See also

[edit]

References

[edit]
  1. ^ "Microsoft announces expansion of Shared Source Initiative".
  2. ^ "Microsoft Shared Source Initiative". Berkman Klein Center. Retrieved 24 Aug 2018.
  3. ^ "Microsoft Public License (MS-PL) – Open Source Initiative". opensource.org.
  4. ^ "Microsoft Reciprocal License (MS-RL) – Open Source Initiative". opensource.org.
  5. ^ a b c d e "Various Licenses and Comments about Them". GNU Operating System. Free Software Foundation. Retrieved 23 Jul 2018.
  6. ^ "RISC OS Open: Welcome". www.riscosopen.org.
  7. ^ "Shared Source Common Language Infrastructure License".
  8. ^ Archiveddocs. "Windows Embedded". msdn2.microsoft.com.
  9. ^ "Microsoft Public License (Ms-PL)". Microsoft.
  10. ^ Foley, Mary. "Microsoft gets the open-source licensing nod from the OSI". ZDNet. Retrieved 22 May 2015.
  11. ^ a b "OSI Approves Microsoft License Submissions". 2007-10-17. Retrieved 2013-08-08. Acting on the advice of the License Approval Chair, the OSI Board today approved the Microsoft Public License (Ms-PL) and the Microsoft Reciprocal License (Ms-RL). The decision to approve was informed by the overwhelming (though not unanimous) consensus from the open source community that these licenses satisfied the 10 criteria of the Open Source definition, and should therefore be approved.
  12. ^ "Microsoft Public License (MS-PL) | Open Source Initiative". opensource.org. Retrieved 2020-08-28.
  13. ^ a b "Microsoft Reciprocal License (Ms-RL)". Microsoft.
  14. ^ John Cowan (2005-12-09). "For Approval: Microsoft Community License". license-discuss mailing list.
  15. ^ Peter Galli (2006-08-22). "Blogger Can't Tempt Microsoft To Drink OSI Kool-Aid". eWeek.
  16. ^ Tim O'Reilly (2007-07-26). "Microsoft to Submit Shared Source Licenses to OSI". O'Reilly Radar.
  17. ^ "Microsoft Limited Public License (Ms-LPL)". Microsoft.
  18. ^ a b "The Open Source Definition". Open Source Initiative.
  19. ^ "Microsoft Limited Reciprocal License (Ms-LRL)". Microsoft.
  20. ^ "Microsoft Reference Source License". Microsoft. 2016-07-06. Retrieved 2016-07-06. "Reference use" means use of the software within your company as a reference, in read only form, for the sole purposes of debugging your products, maintaining your products, or enhancing the interoperability of your products with the software, and specifically excludes the right to distribute the software outside of your company.
  21. ^ "Microsoft Reference Source License".
  22. ^ Michael Tiemann (2007-11-11). "Who Is Behind "Shared Source" Misinformation Campaign?". Retrieved 2011-03-12. Shared source is a marketing term created and controlled by Microsoft. Shared source is not open source by another name. Shared source is an insurgent term that distracts and dilutes the Open Source message by using similar-sounding terms and offering similar-sounding promises. And to date, 'shared source' has been a marketing dud as far as Open Source is concerned.
  23. ^ Evaluating Microsoft’s Shared Source licenses Ars Technica, 2007
[edit]
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