Comment by CopperWing

As far as the Wikipedia definition of it goes, yes it is a "weak copyleft", but that basically means that the license on code and patents is liberal, while license on trademarks is not. That is to prevent bottom feeders to take for example Firefox and LibreOffice, rebuild them with adware and malware and redistribute new installers as "Super Firefox", "LibreOffice Improved" or other misleading trademarks.