Like other large open-source projects by Google, Microsoft and others, contributors sign a contributor's agreement that gives Oracle joint ownership. This means

Like other large open-source projects by Google, Microsoft and others, contributors sign a contributor's agreement that gives Oracle joint ownership. This means that, in addition to the GPL license, either you or Oracle can license that code as you or they please. This is a fairly standard practice.[1] [1]: https://en.wikipedia.org/wiki/Contributor_License_Agreement https://en.wikipedia.org/wiki/Contributor_License_Agreement