Legal hair splitting.
Just for fun:
Since calibre is its own development environment, by installing calibre you are gaining the ability to modify it, not just use it. And in order to modify it, you must abide by the terms of the GPL, quoting section 9 of the GPL
Quote:
You are not required to accept this License in order to receive or
run a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
modify any covered work. These actions infringe copyright if you do
not accept this License. Therefore, by modifying or propagating a
covered work, you indicate your acceptance of this License to do so.
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