The theory of relativity, or simply relativity in physics, usually encompasses two theories by Albert Einstein: special relativity and general relativity.  (The word relativity can also be used in the context of an older theory, that of Galilean invariance.)
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This is an audiobook or something
Like a lot of the free books on the iTunes Store, this one is terribly labelled. It is not Einstein's Theory of Relativty. It is some sort of weird 8 page intro for an audiobook that isn't included.
This was only a description of some copyright rule, nothing to do with Einstein... Or anything for that matter. Was 7 pages long and a waste of time.