leecher in Tenen & Foxman 2014

evermind*. Under the centralized model of file sharing, the friend
holding the album would transmit two copies, one to each friend. The
power of *BitTorrent* comes from shifting the burden of sharing from a
single seeder (friend one) to a "swarm" of leechers (friends two and
three). On this model, the first leecher joining the network (friend
two, in our case) would begin to get his data from the seeder directly,
as before. But the second leecher would receive some bits from the
seeder and some from the first leecher, in a non-linear, asynchronous
fashion. In our example, we can imagine the remaining friend getting
some songs from the first friend and some from the second. The friend
who held the album originally now transmitted something less than two
full copie

ient" is responsible for checking the
integrity of the pieces and for reassembling the them into a coherent
whole. A torrent "tracker" coordinates the activity between peers,
keeping track of who has what where. Having received the whole document,
a leecher can, in turn, become a seeder by sharing all of his downloaded
bits with the remaining swarm (who only have partial copies). The
leecher can also take the file offline, choosing not to share at

The original protocol left torrent trackers vulnerable to charges of
aiding and abetting copyright
infringement.^[43](#fn-2025-43){#fnref-2025-43}^ Earl


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