Merge pull request #1586 from OBOFoundry/matentzn-patch-12

Clarifying license properties

principles/fp-001-open.md

@@ -18,7 +18,7 @@ OBO Foundry ontologies are resources for the entire biological and biomedical co
 
 ### For ontology providers
 
-OBO Foundry Ontologies MUST EITHER be released under a [Creative Commons](https://creativecommons.org/) [CC-BY license version 3.0](https://creativecommons.org/licenses/by/3.0/) or later, OR released into the public domain under [CC0](https://creativecommons.org/publicdomain/zero/1.0/). It should be clearly stated in the ontology file.
+OBO Foundry Ontologies MUST EITHER be released under a [Creative Commons Attribution 3.0 Unported (CC BY 3.0)](https://creativecommons.org/licenses/by/3.0/) license or later (e.g. [Attribution 4.0 International (CC BY 4.0)](https://creativecommons.org/licenses/by/4.0/), OR released into the public domain under [Creative Commons CC0 1.0 Public Domain Dedication (CC0 1.0)](https://creativecommons.org/publicdomain/zero/1.0/). The license MUST be clearly stated using the http://purl.org/dc/terms/license property followed by the URL representing the license (e.g. https://creativecommons.org/licenses/by/3.0/) in the ontology file ([OWL example](https://github.com/INCATools/ontology-development-kit/blob/master/docs/License.md)).
 
 Note: CC-BY licenses allow others to distribute, remix, tweak, and build upon the work, even commercially, as long as they credit the creators for the original creation. CC0 specifies that the creators of an ontology waive, to the extent that they legally can be, all rights and place the ontology in the public domain. It does not prevent them from requesting that the ontology be properly credited and cited, but prevents any legal recourse if it is not credited. Many pros and cons of CC-BY versus CC0 are laid out in [this discussion](https://github.com/OBOFoundry/OBOFoundry.github.io/issues/285). It is important to note that one can move from CC-BY to CC0 but not the other way around.