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Difference between revisions of "Technical Team/Proposals/2010-10-21/Composite licensing"
| Line 5: | Line 5: | ||
<h2>Issue</h2> | <h2>Issue</h2> | ||
| − | <p>There are some licensing scenarios which are not expressable in SPDX. | + | <p>There are some licensing scenarios which are not expressable in SPDX. For example, there is currently no way to express that a file can be used under the licenses A and B or A and C.</p> |
| − | For example, there is currently no way to express that a file can be | + | |
| − | used under the licenses A and B or A and C.</p> | + | |
<h3>Use cases</h3> | <h3>Use cases</h3> | ||
| Line 22: | Line 20: | ||
<h2>Proposal</h2> | <h2>Proposal</h2> | ||
| − | <p>Introduce a license set concept to cover all these use cases. | + | <p>Introduce a license set concept to cover all these use cases. Specifically, a `ConjunctiveLicenseSet` and a `DisjunctiveLicenseSet`. Members of these types of sets would be of type `License`, `ConjunctiveLicenseSet` or `DisjunctiveLicenseSet`. This would allow composing licensing information in arbitrary conjunctive and disjunctive groupings.</p> |
| − | Specifically, a `ConjunctiveLicenseSet` and a `DisjunctiveLicenseSet`. Members of these types of sets would be of | + | |
| − | type `License`, `ConjunctiveLicenseSet` or `DisjunctiveLicenseSet`. | + | |
| − | This would allow composing licensing information in arbitrary | + | |
| − | conjunctive and disjunctive groupings.</p> | + | |
| − | <p>The definition of `License` would not change. The `DeclaredLicense` and `DetectedLicense` properties would be | + | <p>The definition of `License` would not change. The `DeclaredLicense` and `DetectedLicense` properties would be updated to allow their value to be a `License`, `ConjunctiveLicenseSet`, or `DisjunctiveLicenseSet`.</p> |
| − | updated to allow their value to be a `License`, | + | |
| − | `ConjunctiveLicenseSet`, or `DisjunctiveLicenseSet`.</p> | + | |
<h3>Examples</h3> | <h3>Examples</h3> | ||
Revision as of 17:56, 29 November 2010
Contents
Status
Draft
Issue
There are some licensing scenarios which are not expressable in SPDX. For example, there is currently no way to express that a file can be used under the licenses A and B or A and C.
Use cases
The set of use cases we need to be able to describe in SPDX is:
a single license
choice of one from multiple single licenses
multiple licenses (conjunctive)
choice of one from multiple conjunctive license sets
Proposal
Introduce a license set concept to cover all these use cases. Specifically, a `ConjunctiveLicenseSet` and a `DisjunctiveLicenseSet`. Members of these types of sets would be of type `License`, `ConjunctiveLicenseSet` or `DisjunctiveLicenseSet`. This would allow composing licensing information in arbitrary conjunctive and disjunctive groupings.
The definition of `License` would not change. The `DeclaredLicense` and `DetectedLicense` properties would be updated to allow their value to be a `License`, `ConjunctiveLicenseSet`, or `DisjunctiveLicenseSet`.
Examples
Single license
<code><br /> <Package><br /> <DeclaredLicense><br /> <rdf:Description rdf:about="license:GPL" /><br /> </DeclaredLicense><br /> </Package><br /></code>
Disjunctive licenses
<code><br /> <Package><br /> <DeclaredLicense><br /> <ConjunctiveLicenseSet><br /> <licenses rdf:parseType="Collection"><br /> <rdf:Description rdf:about="license:GPL" /><br /> <rdf:Description rdf:about="license:BSD" /><br /> </licenses><br /> </ConjunctiveLicenseSet><br /> </DeclaredLicense><br /> </Package><br /></code>
Complex disjunctive licenses
<code><br /> <Package><br /> <DeclaredLicense><br /> <DisjuntiveLicenseSet><br /> <licenses rdf:parseType="Collection"><br /> <ConjunctiveLicenseSet><br /> <licenses rdf:parseType="Collection"><br /> <rdf:Description rdf:about="license:GPL" /><br /> <rdf:Description rdf:about="license:BSD" /><br /> </licenses><br /> </ConjunctiveLicenseSet><br /> <ConjunctiveLicenseSet><br /> <licenses rdf:parseType="Collection"><br /> <rdf:Description rdf:about="license:GPL" /><br /> <rdf:Description rdf:about="license:Apache" /><br /> </licenses><br /> </ConjunctiveLicenseSet><br /> </licenses><br /> </DisjuntiveLicenseSet><br /> </DeclaredLicense><br /> </Package><br /><br /></code>
Changes
These changes are available in the <a href="https://github.com/pezra/spdx-spec/tree/compositeslicensing">'composite-licensing'</a> branch of <a href="https://github.com/pezra/spdx-spec.git">https://github.com/pezra/spdx-spec.git</a>. A full version of the spec with these changes is attached, as is a patch file to implement these changes.
