Sharealike: Difference between revisions
making clear that "viral license" = "share-alike" = defining attribute of open content and free documentation
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''' | '''Share-alike''' is a required reintegration clause of several [[parametric license]]s in [[Creative Commons]] and some monolithic ones like [[GFDL]]. It simply means that anyone improving a work must share the improved work with others who wish to use or improve it. | ||
It is a key feature of the [[GPL]] too which applies this principle to [[source code]]. It is sometimes called the '''viral license''' feature - the fact that accepting the license breeds more acceptance of the license. This is considered very desirable by some and very undesirable by others (who started the [[open source]] movement to oppose the '''share-alike''' requirement. ''See also [[problems with free software and open source models]].'' | |||
The '''CC- | The most common '''share-alike''' licenses used are in '''open content''' and in '''free documentation''' efforts, which require such licenses by definition: | ||
*the [[GFDL]], strictly share-alike, no license but the GFDL can apply to any improvements, and there are strict rules about what can go in [[Secondary Section]]s and [[Invariant Section]]s to which asymmetric rules might apply - this license is used at [[Wikipedia]] | |||
*the [[CC-by-sa]] license, quite close to the [[GFDL]] but is incompatible with it. ''Things licensed under the CC regime are not part of the [[GFDL Corpus]].'' This license is used at [[Wikitravel]] | |||
Most efforts use share alike licenses for both code and content, e.g. the '''CC-nc-sa''' license - the closest approximation yet to a [[Green Documentation License]] - is used for [[GetWiki]] code. | |||
''See [[w:Share_Alike]] for a more general introduction linked to other legal topics.'' | ''See [[w:Share_Alike]] for a more general introduction linked to other legal topics.'' | ||