New York City Gridlock by Roy Googin / CC BY-SATwo, with a proliferation of rights, it is harder to know who has exclusive control over what, or whether multiple parties have exclusive control over different rights over a work. This phenomena of too many property claims forms what is sometimes called an anticommons — overlapping exclusive claims can prevent anyone from using a work — the opposite (thus “anti”) of a commons, in which anyone may use a work under a clear, easily discernible set of rules.