i have questions about licensing in libreoffice.

users
#1

No, it is completely wrong.

Sun owned the copyright of the code (as a consequence of StarDivision
acquisition in 1999), and was asking for a contributor agreement (CLA)
to maintain the copyright on the entire source code (including code
contributed by volunteers, as they were signing the CLA).

Because of this situation, Oracle acquired the ownership of the entire
OOo source code with the acquisition of Sun.