[1] Open Definition 2.1 - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge, Open Knowledge Open Definition Group, , https://opendefinition.org/od/2.1/en/
[2] The Open Definition - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge, Open Knowledge Open Definition Group, , https://opendefinition.org/
[4] GitHub - okfn/opendefinition: Open Definition source, https://github.com/okfn/opendefinition
[5] Licenses API - Open Definition - Defining Open in Open Data, Open Content and Open Knowledge, Open Knowledge Open Definition Group, , https://opendefinition.org/licenses/api/
[6] Merge https://github.com/okfn/licenses with this repo ... · Issue #7 · okfn/opendefinition · GitHub, https://github.com/okfn/opendefinition/issues/7
[7] GitHub - okfn/licenses: Open source and open knowledge (data and content) licenses together with API and web service., https://github.com/okfn/licenses
[3] 関連: ライセンス, 開放型, Open Knowledge