Liferay is an enterprise portal software.
One of its components is Liferay Sync.
QUESTION: Where can I find the source code of Liferay Sync?
Unlike other Liferay components, it does not seem to be present at https://github.com/liferay.
Their website says "Liferay Portal is the leading open source portal for the enterprise". Wikipedia says it is LGPL-licensed AND proprietary.