L4LOD Vocabulary Specification 0.2

Namespace Document 10 May 2013

This version:
http://ns.inria.fr/l4lod/v2/ (rdf)
Latest version:
http://ns.inria.fr/l4lod/ (rdf)
Previous version:
http://ns.inria.fr/l4lod/v1/ (rdf)
Status:
Work in progress
Authors:
Serena Villata
Fabien Gandon

Abstract

L4LOD (Licenses for Linked Open Data) is a lightweight vocabulary for expressing the licensing terms in the Web of Data. The vocabulary is not intended to propose yet another license, but it is intended to provide the basic means to define in a machine-readable format, i.e., RDF, the existing licensing terms. The vocabulary does not provide an exhaustive set of properties for licenses definition. Implementations are free to extend L4LOD to add further elements.

Before presenting the classes and properties of the vocabulary, we propose the results of our crawler over the Linked Data Cloud as a coloured cloud where colours represent the different licenses associated to the data.
This work is available under a CC-BY-SA license. This means you can include it in any other work under the condition that you give proper attribution.

LOD cloud with licenses

Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/

The distribution of the different licenses over the data sets of the LOD cloud is

Distribution of licenses over the LOD cloud

L4LOD Vocabulary at a Glance

An a-z index of L4LOD terms, by class (categories or types) and by property.

Classes: | Attribution | Citation | CommercialExpl | Derivative | Distribution | License | NoCommercial | NoDerivative | Obligation | Permission | Prohibition | Publishing | Reproduction | ShareAlike | Sharing | Using |

Properties: | licensingTerms | licensor | obliges | permits | prohibits |

The following figure provides a schematic representation of L4LOD vocabulary.

L4LOD Ontology Overview

The L4LOD cross-reference: Listing the L4LOD Classes and Properties

The L4LOD introduces the following classes and properties.

Classes: | Attribution | Citation | CommercialExpl | Derivative | Distribution | License | NoCommercial | NoDerivative | Obligation | Permission | Prohibition | Publishing | Reproduction | ShareAlike | Sharing | Using |

Properties: | licensingTerms | licensor | obliges | permits | prohibits |

Classes and Properties (full detail)


Classes

Class: l4lod:Attribution

Attribution - This class is used to express the obligation of attribution to author of the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:Citation

Citation - This class is used to express the obligation of citation of the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:CommercialExpl

CommercialExpl - This class is used to express the permission to commercially exploit the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:Derivative

Derivative - This class is used to express the permission to distribute derivative works from the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:Distribution

Distribution - This class is used to express the permission to distribute the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:License

License - A license is a set of prohibitions, permissions and obligations.
Status: stable
Properties include: obliges licensor permits prohibits licensingTerms
Equivalent class of limo:LicenseModel cc:License

[#] [back to top]


Class: l4lod:NoCommercial

NoCommercial - The class is used to express the prohibition of commercial use of the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:NoDerivative

NoDerivative - The class is used to express the prohibition of producing derivative work of the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:Obligation

Obligation - The class is used to express the obligations associated to the licensed data.
Status: stable
Used with: obliges
Has sub class Citation ShareAlike Attribution

[#] [back to top]


Class: l4lod:Permission

Permission - The class is used to express the permissions associated to the licensed data.
Status: stable
Used with: permits
Has sub class Using Reproduction Publishing Sharing Derivative CommercialExpl Distribution

[#] [back to top]


Class: l4lod:Prohibition

Prohibition - The class is used to express the prohibitions associated to the licensed data.
Status: stable
Used with: prohibits
Has sub class NoDerivative NoCommercial

[#] [back to top]


Class: l4lod:Publishing

Publishing - This class is used to express the permission to publish the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:Reproduction

Reproduction - This class is used to express the permission of making multiple copies of the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:ShareAlike

ShareAlike - This class is used to express the obligation of for the derivative works be licensed under the same terms of the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:Sharing

Sharing - This class is used to express the permission to copy, distribute and use the licensed data.
Status: stable

[#] [back to top]


Class: l4lod:Using

Using - This class is used to express the permission to use the licensed data.
Status: stable

[#] [back to top]


Properties

Property: l4lod:licensingTerms

licensingTerms - This property associates the License to the URI of the human-readable text describing the license.
Status: stable
Domain: License
Range: dc:LicenseDocument

[#] [back to top]


Property: l4lod:licensor

licensor - This property associates the License to issuer of the license.
Status: stable
Domain: License
Range: rdfs:Literal

[#] [back to top]


Property: l4lod:obliges

obliges - The property defines the obligations associated to the license.
Status: stable
Domain: License

[#] [back to top]


Property: l4lod:permits

permits - The property defines the permissions associated to the license.
Status: stable
Domain: License

[#] [back to top]


Property: l4lod:prohibits

prohibits - The property defines the prohibitions associated to the license.
Status: stable
Domain: License

[#] [back to top]


External Vocabulary References

Classes
dc:LicenseDocument, cc:License, omv:LicenseModel, premis:LicenseInformation, voag:LicenseModel, gr:License, meb:License, cc:Permission, cc:Prohibition, cc:Requirement, odrl:Permission, odrl:Prohibition, odrl:Duty, cc:CommercialUse, cc:Attribution, cc:ShareAlike, cc:Reproduction, cc:DerivativeWorks, cc:Sharing, cc:Distribution, limo:LicenseModel, limo:LegalTerms, limo:UseConditions, limo:DistributionConditions, limo:Rights
Properties
odrl:permission, odrl:prohibition, odrl:duty, cc:legalCode, waiver:declaration, nie:licenseType, premis:licenseTerms, limo:creator