Difference between revisions of "Share Alike"

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(→‎SA, aka Share Alike.)
 
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''The following was contributed by [[anonymous trolls]] in 2004.  It is rather amazing that it was not ported into [[this wiki]] from its predecessor rather than continuing to be enhanced.  An exact definition of this concept is one of the foundations of CC itself.''
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__NOTOC__
  
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The '''Share Alike''' option of the [[Creative Commons public license]] is a specific interpretation of the general [[share-alike]] ideal which is also found in [[copyleft]] (i.e. [[Free Software]]).
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=SA, aka Share Alike.=
  
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== share with (some) others ==
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The Share Alike aspect requires all derivatives of a work to be licensed under the same (or a compatible) license as the original. Thus, if a person were to use parts of a BY-SA movie to create a new short film that new short film would also need to be licensed as BY-SA. 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. This is in contrast to the Attribution-only license from CC where a derivative could be released under full copyright restrictions (All Rights Reserved).
  
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The SA license is similar to a [[consortium license]] or other [[peer group]] contracts.
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As changes have been made to the Creative Commons licenses over the years there have been 4 versions of the BY-SA and BY-NC-SA licenses (1.0, 2.0, 2.5, and 3.0<ref name="version3">The 3.0 licenses added a compatibility clause. Creative Commons may declare a license compatible with ShareAlike, allowing it to be used instead of the exact same license for derivatives. </ref>). Creative Commons has taken steps to ensure that works licensed under one particular version of the Creative Commons Attribution-ShareAlike license can be incorporated with a work from a later version. Specifically, any work that is licensed with a BY-SA or BY-NC-SA version 2.0 or higher can be used with any later version of the license. For specifics see the chart below.
  
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The CC concept of Share Alike means strictly and only "share with (some) others on the same terms they have shared with you".  It does not require that this sharing be with "everyone" as in "copyleft".  Though that is an option (the [[CC-by-sa]] for instance) in the CC [[parametric license]] regime it is not a universal:  the [[CC-by-nc-sa]] for instance does not share with commercial parties. In this sense it is like a sort of nonprofit [[consortium license]].
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{| style="width:600px;" border="1" cellpadding="10"
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|-
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| &nbsp;
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| colspan="9" align="center" | '''A Derivative can use the corresponding license version''':
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|-
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| '''If the original work was:''' || [http://creativecommons.org/licenses/by-sa/1.0/ 1.0] || [http://creativecommons.org/licenses/by-sa/2.0/ 2.0] || [http://creativecommons.org/licenses/by-sa/2.5/ 2.5] || [http://creativecommons.org/licenses/by-sa/3.0/ 3.0] <ref name="version3"/>
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|-
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|  BY-SA version [http://creativecommons.org/licenses/by-sa/1.0/ 1.0] || style="background-color:green;" | &nbsp; || &nbsp; || &nbsp; || &nbsp;
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|-
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| BY-NC-SA version [http://creativecommons.org/licenses/by-nc-sa/1.0/ 1.0] || style="background-color:green;" | &nbsp; || &nbsp; || &nbsp; || &nbsp;
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|-
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| BY-SA version [http://creativecommons.org/licenses/by-sa/2.0/ 2.0] || &nbsp; || style="background-color:green;" | &nbsp; || style="background-color:green;" | &nbsp; || style="background-color:green;" | &nbsp;
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|-
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| BY-NC-SA version [http://creativecommons.org/licenses/by-nc-sa/2.0/ 2.0] || &nbsp; || style="background-color:green;" | &nbsp; || style="background-color:green;" | &nbsp; || style="background-color:green;" | &nbsp;
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|-
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| BY-SA version [http://creativecommons.org/licenses/by-sa/2.5/ 2.5] || &nbsp; || &nbsp; || style="background-color:green;" | &nbsp; || style="background-color:green;" | &nbsp;
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|-
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| BY-NC-SA version [http://creativecommons.org/licenses/by-nc-sa/2.5/ 2.5] || &nbsp; || &nbsp; || style="background-color:green;" | &nbsp; || style="background-color:green;" | &nbsp;
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|-
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| BY-SA version [http://creativecommons.org/licenses/by-sa/3.0/ 3.0] <ref name="version3"/>|| &nbsp; || &nbsp; || &nbsp; || style="background-color:green;" | &nbsp;
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|-
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| BY-NC-SA version [http://creativecommons.org/licenses/by-nc-sa/3.0/ 3.0] <ref name="version3"/>|| &nbsp; || &nbsp; || &nbsp; || style="background-color:green;" | &nbsp;
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|-
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|}
  
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== shareware, science, documentation ==
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<references/>
  
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Its general concept of sharing might include for instance a:
 
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*[[shareware license]] where all who have paid a certain license fee might have the right to [[source code]], but all others not.
 
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*[[science license]] where all who have followed the [[scientific method]] may be able to make [[derivative work]]s, but others would be subject to a [[NoDerivs]] restriction, as their derivative works would not advance science.
 
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*[[CC-by-sa-fd]] which would enable sharing of [[GFDL corpus]] into the [[Common Content]] base.
 
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== not all Common Content is SA ==
 
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Share Alike is orthogonal to [[Common Content]] as the latter includes both SA and non-SA terms on that content.
 
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== open content, free software are SA ==
 
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The generic idea of [[share-alike]] is probably the base concept of [[open content]], [[Free Software]], which apply additional requirements that SA alone doesn't:
 
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*open content requires more careful specific [[attribution]]
 
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*Free Software requires sharing with literally everyone
 
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Accordingly it is possible to bring both of these ultimately into the [[parametric license]] regime both as SA licenses.
 
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== open source is not SA ==
 
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Open source requires sharing with literally everyone but does not require them to share back with you - they can make their own proprietary extensions and enhancements and can withhold them.  Accordingly open source is simply not SA but is more like the [[CC-by]] - though open source does not in many cases guarantee credit or any means of creator validation.  It is a simple gift to everyone that can be used against its creator, or against its creator's values.
 
  
 
[[category:license]]
 
[[category:license]]

Latest revision as of 19:33, 24 January 2011


SA, aka Share Alike.

The Share Alike aspect requires all derivatives of a work to be licensed under the same (or a compatible) license as the original. Thus, if a person were to use parts of a BY-SA movie to create a new short film that new short film would also need to be licensed as BY-SA. 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. This is in contrast to the Attribution-only license from CC where a derivative could be released under full copyright restrictions (All Rights Reserved).

As changes have been made to the Creative Commons licenses over the years there have been 4 versions of the BY-SA and BY-NC-SA licenses (1.0, 2.0, 2.5, and 3.0[1]). Creative Commons has taken steps to ensure that works licensed under one particular version of the Creative Commons Attribution-ShareAlike license can be incorporated with a work from a later version. Specifically, any work that is licensed with a BY-SA or BY-NC-SA version 2.0 or higher can be used with any later version of the license. For specifics see the chart below.

  A Derivative can use the corresponding license version:
If the original work was: 1.0 2.0 2.5 3.0 [1]
BY-SA version 1.0        
BY-NC-SA version 1.0        
BY-SA version 2.0        
BY-NC-SA version 2.0        
BY-SA version 2.5        
BY-NC-SA version 2.5        
BY-SA version 3.0 [1]        
BY-NC-SA version 3.0 [1]        
  1. ↑ 1.0 1.1 1.2 1.3 The 3.0 licenses added a compatibility clause. Creative Commons may declare a license compatible with ShareAlike, allowing it to be used instead of the exact same license for derivatives.
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