H. Private Tracker
A private tracker restricts use by requiring users to register
with the site. To control registration, many private trackers
use an invitation system, in which active and contributing
members are given the ability to grant a new user permission
to register at the site [2]. Most private trackers monitor how
many users upload or download content and, in most
situations, enforce a minimum upload-to-download ratio.
Some of the advantages of a private tracker versus a public
one are higher speeds, a tighter community, and safer
downloads. Almost all private trackers implement a passkey
system, where each user is given a personalized announce
URL, so that, if a distribution is unauthorized, it can be
pinpointed to the responsible user. An example of a private
tracker is Oink's Pink Palace, which was forcibly shut down
in late 2007 by law enforcement officials.
Some members of a closed community might find it hard to maintain the required ratio. Competitions might be offered with prizes of improved ratios. Some trackers exchange ratio credit for donations, and others use "free leech" systems to improve the user’s ratios. When downloading a free leech torrent, only the upload is logged, the download is ignored. Large torrents are usually offered as free leech. For the sake of internet etiquette, seeding to a ratio of at least 1 is still recommended even for free leech torrents.
IV. INFORMATION-GATHERING MECHANISM DESIGN FOR
TRACKING A HEAVY UPLOADER
Fig. 2 depicts the proposed system configuration for
recognition and tracking of BitTorrent. Torrent server has
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