For licence documents (dct: type), the use of the ADMS licence type vocabulary would require each portal to continuously perform a local mapping to the actual licence list in use. This generates considerable overhead and is practically impossible to do after the fact for existing data in the portal. Making this aggregate level mapped to actual data available for search would eventually make searches too heavy to run, thus degrading user experience. Creative Commons licences are recommended by ATT and having the licence information in a machine readable format should be enough to ensure interoperability between portals.

This issue has been reported by Pirjo-Leena Forsström:

http://joinup.ec.europa.eu/mailman/archives/dcat_application_profile/2015-August/000296.html

Issue is related to:

https://joinup.ec.europa.eu/discussion/pr23-remove-licence-type-licence-document

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