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{{Short description|Condition in some free copyright licenses}}
[[Image:Cc-sa.svg|thumb|The [[Creative Commons]] icon for Share-Alike, a variant of the [[copyleft]] symbol]]
[[Image:Cc-sa.svg|thumb|The [[Creative Commons]] icon for Share-Alike, a variant of the [[copyleft]] symbol]]


'''Share-alike''' is a [[Copyright|copyright licensing]] term, originally used by the [[Creative Commons]] project, to describe works or licences that require copies or adaptations of the work to be released under the same or similar licence as the original.<ref>{{cite web|url=http://opendatahandbook.org/en/glossary.html#term-share-alike-license |title=Glossary |accessdate=2012-03-05}}</ref> [[Copyleft]] licences are [[free content]] or [[free software]] licences with a share-alike condition.
'''Share-alike''' (🄎) is a copyright licensing term, originally used by the [[Creative Commons]] project, to describe works or licenses that require copies or adaptations of the work to be released under the same or similar license as the original.<ref>{{cite web |title=Glossary |url=http://opendatahandbook.org/en/glossary.html#term-share-alike-license |url-status=unfit |archive-url=https://web.archive.org/web/20120222061636/http://opendatahandbook.org/en/glossary.html |archive-date=2012-02-22 |access-date=2012-03-05}}</ref> [[Copyleft]] licenses are [[free content]] or [[free software]] licenses with a share-alike condition.


Two currently-supported Creative Commons licences have the ShareAlike condition: Creative Commons Attribution-ShareAlike (a [[copyleft]], [[free content]] licence) and Creative Commons Attribution-NonCommercial-ShareAlike (a proprietary licence).
Two currently-supported Creative Commons licenses have the ShareAlike condition: Creative Commons Attribution-ShareAlike (a [[copyleft]], [[free content]] license) and Creative Commons Attribution-NonCommercial-ShareAlike (a proprietary license).


The term has also been used outside copyright law to refer to a similar plan for [[License|patent licensing]].<ref>{{cite web|url=http://blog.iandavis.com/2011/08/08/share-alike-patents/ |title=Share-Alike Patents |accessdate=2012-03-05}}</ref>
The term has also been used outside copyright law to refer to a similar plan for [[License|patent licensing]].<ref>{{cite web |last=Davis |first=Ian |date=2011-08-08 |title=Share-Alike Patents |url=http://blog.iandavis.com/2011/08/08/share-alike-patents/ |url-status=dead |archive-url=https://web.archive.org/web/20120403085630/http://blog.iandavis.com/2011/08/08/share-alike-patents/ |archive-date=2012-04-03 |access-date=2012-03-05}}</ref>


==Copyleft==
<span class="notranslate" onmouseover="_tipon(this)" onmouseout="_tipoff()"><span class="google-src-text" style="direction: ltr; text-align: left">==Copyleft== {{Main|Copyleft}} '''Copyleft''' or [[Gratis versus libre|libre]] share-alike licences are the largest subcategory of share-alike licences.</span> == Copyleft == {{اصلی | Copyleft}} '' 'Copyleft' 'یا [[Gratis در مقابل libre | libre]] مجوزهای سهم یکسان بزرگترین زیر مجموعه مجوزهای سهم یکسان هستند.</span> <span class="notranslate" onmouseover="_tipon(this)" onmouseout="_tipoff()"><span class="google-src-text" style="direction: ltr; text-align: left">They include both [[free content]] licences like Creative Commons Attribution-ShareAlike and [[free software]] licences like the [[GNU General Public License]].</span> آنها شامل مجوزهای [[محتوای رایگان]] مانند مجوزهای Creative Commons Attribution-ShareAlike و [[نرم افزار رایگان] مانند [[مجوز عمومی عمومی گنو]].</span> <span class="notranslate" onmouseover="_tipon(this)" onmouseout="_tipoff()"><span class="google-src-text" style="direction: ltr; text-align: left">These licences have been described pejoratively as [[viral license|viral licences]], because the inclusion of copyleft material in a larger work typically requires the entire work to be made copyleft.</span> این مجوزها به عنوان [[مجوزهای ویروسی | مجوزهای ویروسی]] توصیف شده است ، زیرا درج مطالب کپیلافت در یک کار بزرگتر به طور معمول مستلزم ساخت کلیه کارها است.</span> <span class="notranslate" onmouseover="_tipon(this)" onmouseout="_tipoff()"><span class="google-src-text" style="direction: ltr; text-align: left">The term '''reciprocal license''' has also been used to describe copyleft, but has also been used for non-libre licenses (see, for example, the [[Microsoft Limited Reciprocal License]]).</span> اصطلاح '' مجوز متقابل '' نیز برای توصیف copyleft استفاده شده است ، اما همچنین برای مجوزهای غیر لیبره نیز مورد استفاده قرار گرفته است (مثلاً به [[Microsoft Limited Reciprocal License]] مراجعه کنید).</span> <span class="notranslate" onmouseover="_tipon(this)" onmouseout="_tipoff()"><span class="google-src-text" style="direction: ltr; text-align: left">Free content and software licences without the share-alike requirement are described as [[permissive software licence|permissive licences]].</span> محتوای مجوز و مجوزهای نرم افزاری بدون نیاز به اشتراک مشابه به عنوان [[مجوز نرم افزار مجاز | مجوزهای مجاز]] توصیف شده است.</span>
{{Main|Copyleft}}

'''Copyleft''' or [[Gratis versus libre|libre]] share-alike licenses are the largest subcategory of share-alike licenses. They include both [[free content]] licenses like Creative Commons Attribution-ShareAlike and [[free software]] licenses like the [[GNU General Public License]]. These licenses have been described pejoratively as [[viral license|viral licenses]], because the inclusion of copyleft material in a larger work typically requires the entire work to be made copyleft. The term '''reciprocal license''' has also been used to describe copyleft, but has also been used for non-libre licenses (see, for example, the [[Microsoft Limited Reciprocal License]]).

Free content and software licenses without the share-alike requirement are described as [[permissive software license|permissive licenses]].


==Creative Commons==
==Creative Commons==
As with all six licences in the current Creative Commons suite, CC Attribution-ShareAlike and CC Attribution-NonCommercial-ShareAlike require [[attribution (copyright)|attribution]]. According to Creative Commons, the advantage of this license is that future users are not able to add new restrictions to a derivative of your work; their derivatives must be licensed the same way.<ref>{{cite web|url=https://wiki.creativecommons.org/wiki/Share_Alike |title=Share Alike |accessdate=2017-08-13}}</ref>
As with all six licenses in the current Creative Commons suite, CC Attribution-ShareAlike and CC Attribution-NonCommercial-ShareAlike require [[attribution (copyright)|attribution]]. According to Creative Commons, the advantage of this license is that future users are not able to add new restrictions to a derivative of your work; their derivatives must be licensed the same way.<ref>{{cite web |date=2011-01-24 |title=Share Alike |url=https://wiki.creativecommons.org/wiki/Share_Alike |url-status=live |archive-url=https://web.archive.org/web/20170813224021/https://wiki.creativecommons.org/wiki/Share_Alike |archive-date=2017-08-13 |access-date=2017-08-13 |website=CC Wiki}}</ref>


The 3.0 and 4.0 version of the ShareAlike licenses include a [[License compatibility|compatibility]] clause, allowing Creative Commons to declare other licenses as compatible and therefore derivatives may use these instead of the license of the original work.
The 3.0 and 4.0 version of the ShareAlike licenses include a [[License compatibility|compatibility]] clause, allowing Creative Commons to declare other licenses as compatible and therefore derivatives may use these instead of the license of the original work.


==Version history==
===Version history===
{{incomplete section|cc-sa-1.0|date=November 2022}}

Over the years, Creative Commons has issued 5 versions of the BY-SA and BY-NC-SA licenses (1.0, 2.0, 2.5, 3.0 and 4.0).
Over the years, Creative Commons has issued 5 versions of the BY-SA and BY-NC-SA licenses (1.0, 2.0, 2.5, 3.0 and 4.0).


*Attribution-ShareAlike Version 1.0 Generic<ref>{{cite web|url=https://creativecommons.org/licenses/by-sa/1.0/ |title=Creative Commons — Attribution-ShareAlike 1.0 Generic — CC BY-SA 1.0 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> and Attribution-NonCommercial-ShareAlike Version 1.0 Generic<ref>{{cite web|url=https://creativecommons.org/licenses/by-nc-sa/1.0/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 1.0 Generic — CC BY-NC-SA 1.0 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> – Released December, 2002
*Attribution-ShareAlike Version 1.0 Generic<ref>{{cite web |url=https://creativecommons.org/licenses/by-sa/1.0/ |title=Creative Commons — Attribution-ShareAlike 1.0 Generic — CC BY-SA 1.0 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2017-08-25 |archive-url=https://web.archive.org/web/20170825053128/https://creativecommons.org/licenses/by-sa/1.0/ |url-status=live }}</ref> and Attribution-NonCommercial-ShareAlike Version 1.0 Generic<ref>{{cite web |url=https://creativecommons.org/licenses/by-nc-sa/1.0/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 1.0 Generic — CC BY-NC-SA 1.0 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2017-08-25 |archive-url=https://web.archive.org/web/20170825052642/https://creativecommons.org/licenses/by-nc-sa/1.0/ |url-status=live }}</ref> – Released December, 2002
*Attribution-ShareAlike Version 2.0 Generic<ref>{{cite web|url=https://creativecommons.org/licenses/by-sa/2.0/ |title=Creative Commons — Attribution-ShareAlike 2.0 Generic — CC BY-SA 2.0 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> and Attribution-NonCommercial-ShareAlike Version 2.0 Generic<ref>{{cite web|url=https://creativecommons.org/licenses/by-nc-sa/2.0/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 2.0 Generic — CC BY-NC-SA 2.0 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> – Released May, 2004
*Attribution-ShareAlike Version 2.0 Generic<ref>{{cite web |url=https://creativecommons.org/licenses/by-sa/2.0/ |title=Creative Commons — Attribution-ShareAlike 2.0 Generic — CC BY-SA 2.0 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2011-02-22 |archive-url=https://web.archive.org/web/20110222183816/http://creativecommons.org//licenses//by-sa//2.0// |url-status=live }}</ref> and Attribution-NonCommercial-ShareAlike Version 2.0 Generic<ref>{{cite web |url=https://creativecommons.org/licenses/by-nc-sa/2.0/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 2.0 Generic — CC BY-NC-SA 2.0 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2017-08-13 |archive-url=https://web.archive.org/web/20170813074244/https://creativecommons.org/licenses/by-nc-sa/2.0/ |url-status=live }}</ref> – Released May, 2004
*Attribution-ShareAlike Version 2.5 Generic<ref>{{cite web|url=https://creativecommons.org/licenses/by-sa/2.5/ |title=Creative Commons — Attribution-ShareAlike 2.5 Generic — CC BY-SA 2.5 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> and Attribution-NonCommercial-ShareAlike Version 2.5 Generic<ref>{{cite web|url=https://creativecommons.org/licenses/by-nc-sa/2.5/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 2.5 Generic — CC BY-NC-SA 2.5 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> – Released June, 2005
*Attribution-ShareAlike Version 2.5 Generic<ref>{{cite web |url=https://creativecommons.org/licenses/by-sa/2.5/ |title=Creative Commons — Attribution-ShareAlike 2.5 Generic — CC BY-SA 2.5 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2011-02-23 |archive-url=https://web.archive.org/web/20110223230501/http://creativecommons.org/licenses/by-sa/2.5/ |url-status=live }}</ref> and Attribution-NonCommercial-ShareAlike Version 2.5 Generic<ref>{{cite web |url=https://creativecommons.org/licenses/by-nc-sa/2.5/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 2.5 Generic — CC BY-NC-SA 2.5 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2017-08-12 |archive-url=https://web.archive.org/web/20170812190917/https://creativecommons.org/licenses/by-nc-sa/2.5/ |url-status=live }}</ref> – Released June, 2005
*Attribution-ShareAlike Version 3.0 Unported<ref>{{cite web|url=https://creativecommons.org/licenses/by-sa/3.0/ |title=Creative Commons — Attribution-ShareAlike 3.0 Unported — CC BY-SA 3.0 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> and Attribution-NonCommercial-ShareAlike Version 3.0 Unported<ref>{{cite web|url=https://creativecommons.org/licenses/by-nc-sa/3.0/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 3.0 Unported — CC BY-NC-SA 3.0 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> – Released March, 2007
*Attribution-ShareAlike Version 3.0 Unported<ref>{{cite web |url=https://creativecommons.org/licenses/by-sa/3.0/ |title=Creative Commons — Attribution-ShareAlike 3.0 Unported — CC BY-SA 3.0 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2011-02-22 |archive-url=https://web.archive.org/web/20110222170930/http://creativecommons.org/licenses/by-sa/3.0/ |url-status=live }}</ref> and Attribution-NonCommercial-ShareAlike Version 3.0 Unported<ref>{{cite web |url=https://creativecommons.org/licenses/by-nc-sa/3.0/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 3.0 Unported — CC BY-NC-SA 3.0 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2018-02-15 |archive-url=https://web.archive.org/web/20180215173358/https://creativecommons.org/licenses/by-nc-sa/3.0/ |url-status=live }}</ref> – Released March, 2007
*Attribution-ShareAlike Version 4.0 International<ref>{{cite web|url=https://creativecommons.org/licenses/by-sa/4.0/ |title=Creative Commons — Attribution-ShareAlike 4.0 International — CC BY-SA 4.0 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> and Attribution-NonCommercial-ShareAlike Version 4.0 International<ref>{{cite web|url=https://creativecommons.org/licenses/by-nc-sa/4.0/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 4.0 International — CC BY-NC-SA 4.0 |publisher=Creativecommons.org |date=1999-02-22 |accessdate=2017-08-13}}</ref> – Released November, 2013
*Attribution-ShareAlike Version 4.0 International<ref>{{cite web |url=https://creativecommons.org/licenses/by-sa/4.0/ |title=Creative Commons — Attribution-ShareAlike 4.0 International — CC BY-SA 4.0 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2016-12-21 |archive-url=https://web.archive.org/web/20161221080402/https://creativecommons.org/licenses/by-sa/4.0/ |url-status=live }}</ref> and Attribution-NonCommercial-ShareAlike Version 4.0 International<ref>{{cite web |url=https://creativecommons.org/licenses/by-nc-sa/4.0/ |title=Creative Commons — Attribution-NonCommercial-ShareAlike 4.0 International — CC BY-NC-SA 4.0 |publisher=Creativecommons.org |date=1999-02-22 |access-date=2017-08-13 |archive-date=2017-08-13 |archive-url=https://web.archive.org/web/20170813021749/https://creativecommons.org/licenses/by-nc-sa/4.0/ |url-status=live }}</ref> – Released November, 2013

==Adoption==

In June 2009 the [[Wikipedia community]] and [[Wikimedia Foundation]] board approved the adoption of the Creative Commons Attribution-ShareAlike (CC BY-SA) license as the main content license for Wikipedia and other Wikimedia sites. Creative Commons hailed this decision as a victory for [[free culture movement|free culture]] as well as visionary leadership.<ref>{{cite web |url=https://creativecommons.org/2009/06/22/wikipedia-cc-by-sa-free-culture-win/ |title=Wikipedia + CC BY-SA = Free Culture Win! |accessdate=2017-08-13 |date=2009-06-22}}</ref>


==See also==
==See also==
Line 38: Line 40:
[[Category:Public copyright licenses]]
[[Category:Public copyright licenses]]
[[Category:Copyleft]]
[[Category:Copyleft]]
[[Category:Free software]]
[[Category:Creative Commons]]


[[vi:Giấy phép Creative Commons#Chia sẻ tương tự]]
[[vi:Giấy phép Creative Commons#Chia sẻ tương tự]]

Revision as of 17:17, 18 February 2024

The Creative Commons icon for Share-Alike, a variant of the copyleft symbol

Share-alike (🄎) is a copyright licensing term, originally used by the Creative Commons project, to describe works or licenses that require copies or adaptations of the work to be released under the same or similar license as the original.[1] Copyleft licenses are free content or free software licenses with a share-alike condition.

Two currently-supported Creative Commons licenses have the ShareAlike condition: Creative Commons Attribution-ShareAlike (a copyleft, free content license) and Creative Commons Attribution-NonCommercial-ShareAlike (a proprietary license).

The term has also been used outside copyright law to refer to a similar plan for patent licensing.[2]

Copyleft

Main article: Copyleft

Copyleft or libre share-alike licenses are the largest subcategory of share-alike licenses. They include both free content licenses like Creative Commons Attribution-ShareAlike and free software licenses like the GNU General Public License. These licenses have been described pejoratively as viral licenses, because the inclusion of copyleft material in a larger work typically requires the entire work to be made copyleft. The term reciprocal license has also been used to describe copyleft, but has also been used for non-libre licenses (see, for example, the Microsoft Limited Reciprocal License).

Free content and software licenses without the share-alike requirement are described as permissive licenses.

Creative Commons

As with all six licenses in the current Creative Commons suite, CC Attribution-ShareAlike and CC Attribution-NonCommercial-ShareAlike require attribution. According to Creative Commons, the advantage of this license is that future users are not able to add new restrictions to a derivative of your work; their derivatives must be licensed the same way.[3]

The 3.0 and 4.0 version of the ShareAlike licenses include a compatibility clause, allowing Creative Commons to declare other licenses as compatible and therefore derivatives may use these instead of the license of the original work.

Version history

Over the years, Creative Commons has issued 5 versions of the BY-SA and BY-NC-SA licenses (1.0, 2.0, 2.5, 3.0 and 4.0).

  • Attribution-ShareAlike Version 1.0 Generic[4] and Attribution-NonCommercial-ShareAlike Version 1.0 Generic[5] – Released December, 2002
  • Attribution-ShareAlike Version 2.0 Generic[6] and Attribution-NonCommercial-ShareAlike Version 2.0 Generic[7] – Released May, 2004
  • Attribution-ShareAlike Version 2.5 Generic[8] and Attribution-NonCommercial-ShareAlike Version 2.5 Generic[9] – Released June, 2005
  • Attribution-ShareAlike Version 3.0 Unported[10] and Attribution-NonCommercial-ShareAlike Version 3.0 Unported[11] – Released March, 2007
  • Attribution-ShareAlike Version 4.0 International[12] and Attribution-NonCommercial-ShareAlike Version 4.0 International[13] – Released November, 2013

See also

References

  1. ^ "Glossary". Archived from the original on 2012-02-22. Retrieved 2012-03-05.{{cite web}}: CS1 maint: unfit URL (link)
  2. ^ Davis, Ian (2011-08-08). "Share-Alike Patents". Archived from the original on 2012-04-03. Retrieved 2012-03-05.
  3. ^ "Share Alike". CC Wiki. 2011-01-24. Archived from the original on 2017-08-13. Retrieved 2017-08-13.
  4. ^ "Creative Commons — Attribution-ShareAlike 1.0 Generic — CC BY-SA 1.0". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-25. Retrieved 2017-08-13.
  5. ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 1.0 Generic — CC BY-NC-SA 1.0". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-25. Retrieved 2017-08-13.
  6. ^ "Creative Commons — Attribution-ShareAlike 2.0 Generic — CC BY-SA 2.0". Creativecommons.org. 1999-02-22. Archived from the original on 2011-02-22. Retrieved 2017-08-13.
  7. ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 2.0 Generic — CC BY-NC-SA 2.0". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-13. Retrieved 2017-08-13.
  8. ^ "Creative Commons — Attribution-ShareAlike 2.5 Generic — CC BY-SA 2.5". Creativecommons.org. 1999-02-22. Archived from the original on 2011-02-23. Retrieved 2017-08-13.
  9. ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 2.5 Generic — CC BY-NC-SA 2.5". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-12. Retrieved 2017-08-13.
  10. ^ "Creative Commons — Attribution-ShareAlike 3.0 Unported — CC BY-SA 3.0". Creativecommons.org. 1999-02-22. Archived from the original on 2011-02-22. Retrieved 2017-08-13.
  11. ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 3.0 Unported — CC BY-NC-SA 3.0". Creativecommons.org. 1999-02-22. Archived from the original on 2018-02-15. Retrieved 2017-08-13.
  12. ^ "Creative Commons — Attribution-ShareAlike 4.0 International — CC BY-SA 4.0". Creativecommons.org. 1999-02-22. Archived from the original on 2016-12-21. Retrieved 2017-08-13.
  13. ^ "Creative Commons — Attribution-NonCommercial-ShareAlike 4.0 International — CC BY-NC-SA 4.0". Creativecommons.org. 1999-02-22. Archived from the original on 2017-08-13. Retrieved 2017-08-13.
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