Selling nothing for something

Long or Short Capital reports that:

[Conceptual] artist Jonathon Keats has digitally generated a span of silence, four minutes and thirty-three seconds in length, portable enough to be carried on a cellphone. His silent ringtone… is expected to bring quiet to the lives of millions of cellphone users, as well as those close to them.

Given the duration of the ringtone, Keats should expect to get sued by the estate of John Cage for copyright infringement.