When it comes to the law, people working on software freedom are often most concerned about copyright and contract law (and the licenses we use under both), since these appear to most directly affect software freedom. How people can use, study, modify, and redistribute the software is naturally of paramount importance and these laws heavily affect those rights. Generally FOSS projects don't consider their brand as much as the software and community being built, and so other fields of law, like trademark, get less consideration.