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Difference between revisions of "Technical Team/Proposals/2010-10-21/Composite licensing"
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| − | + | 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==== | |
| − | < | + | <Package> |
| + | <DeclaredLicense> | ||
| + | <rdf:Description rdf:about="license:GPL" /> | ||
| + | </DeclaredLicense> | ||
| + | </Package> | ||
| − | + | ====Disjunctive licenses==== | |
| − | < | + | <Package> |
| + | <DeclaredLicense> | ||
| + | <ConjunctiveLicenseSet> | ||
| + | <licenses rdf:parseType="Collection"> | ||
| + | <rdf:Description rdf:about="license:GPL" /> | ||
| + | <rdf:Description rdf:about="license:BSD" /> | ||
| + | </licenses> | ||
| + | </ConjunctiveLicenseSet> | ||
| + | </DeclaredLicense> | ||
| + | </Package> | ||
| − | + | ====Complex disjunctive licenses==== | |
| − | < | + | <Package> |
| + | <DeclaredLicense> | ||
| + | <DisjuntiveLicenseSet> | ||
| + | <licenses rdf:parseType="Collection"> | ||
| + | <ConjunctiveLicenseSet> | ||
| + | <licenses rdf:parseType="Collection"> | ||
| + | <rdf:Description rdf:about="license:GPL" /> | ||
| + | <rdf:Description rdf:about="license:BSD" /> | ||
| + | </licenses> | ||
| + | </ConjunctiveLicenseSet> | ||
| + | <ConjunctiveLicenseSet> | ||
| + | <licenses rdf:parseType="Collection"> | ||
| + | <rdf:Description rdf:about="license:GPL" /> | ||
| + | <rdf:Description rdf:about="license:Apache" /> | ||
| + | </licenses> | ||
| + | </ConjunctiveLicenseSet> | ||
| + | </licenses> | ||
| + | </DisjuntiveLicenseSet> | ||
| + | </DeclaredLicense> | ||
| + | </Package> | ||
| + | == Changes == | ||
| − | + | These changes are available in the [https://github.com/pezra/spdx-spec/tree/compositeslicensing 'composite-licensing'] branch of https://github.com/pezra/spdx-spec.git. A full version of the spec with these changes is attached, as is a patch file to implement these changes. | |
| − | + | [[Category:Technical]] | |
Latest revision as of 11:23, 7 March 2013
Status: draft
Contents
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
<Package>
<DeclaredLicense>
<rdf:Description rdf:about="license:GPL" />
</DeclaredLicense>
</Package>
Disjunctive licenses
<Package>
<DeclaredLicense>
<ConjunctiveLicenseSet>
<licenses rdf:parseType="Collection">
<rdf:Description rdf:about="license:GPL" />
<rdf:Description rdf:about="license:BSD" />
</licenses>
</ConjunctiveLicenseSet>
</DeclaredLicense>
</Package>
Complex disjunctive licenses
<Package>
<DeclaredLicense>
<DisjuntiveLicenseSet>
<licenses rdf:parseType="Collection">
<ConjunctiveLicenseSet>
<licenses rdf:parseType="Collection">
<rdf:Description rdf:about="license:GPL" />
<rdf:Description rdf:about="license:BSD" />
</licenses>
</ConjunctiveLicenseSet>
<ConjunctiveLicenseSet>
<licenses rdf:parseType="Collection">
<rdf:Description rdf:about="license:GPL" />
<rdf:Description rdf:about="license:Apache" />
</licenses>
</ConjunctiveLicenseSet>
</licenses>
</DisjuntiveLicenseSet>
</DeclaredLicense>
</Package>
Changes
These changes are available in the 'composite-licensing' branch of https://github.com/pezra/spdx-spec.git. A full version of the spec with these changes is attached, as is a patch file to implement these changes.
