Bibserver is open source MIT. It relies on other open source packages.
Bibserver is a tool that enables easy sharing of bibliographic metadata. It uses the bibJSON format, and converts from other typical formats into bibJSON.
Mention open biblio principles, and refer to bibjson docs page. Point out that content uploaded should be freely available, but licenses can be attached to collections if desired.
Typically, public domain / open access should be licensed as such.