Z:gnu-www-ja-gpl-faq--f14151-GPLv3 addresses this problem i/en

GPLv3 addresses this problem in two ways. First, people who download this torrent and send the data to others as part of that process are not required to do anything. That's because section 9 says &ldquo;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 [of the license].&rdquo;