1 Is Content Publishing in BitTorrent Altruistic or Profit-Driven? 梁懿.
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Transcript of 1 Is Content Publishing in BitTorrent Altruistic or Profit-Driven? 梁懿.
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Is Content Publishing in BitTorrent Altruistic or Profit-Driven?
梁懿
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Outline
★ Measurement Methodology
★Analysis of Collective Data
★Incentives of Major Publishers
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Question
What are the main incentives of major content publishers in BitTorrent?
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How a user joins a BitTorrent swarm?
.torrent file -> tracker -> number of seeders + random IP address of peers (50)
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Two BitTorrent Portals: Mininova, Pirate Bay
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Measurement methodology
Identifying Initial Publisher:Username: portalIP address: .torrent file (newest -> peers least)MaxMind Database: publisher IP address, downloader IP address, ISP, geography location.
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Dataset Description
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Skewness of Contribution
3% publishers contribute 40% resources
In pb10 dataset, 40% top100 publishers no download ,
80% download less than 5 files7
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Wonder
Significant amount of processing and bandwidth + Legal implications
Why this small fraction of publishers allocate a great deal of resources into BitTorrent swarms?
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OVH(hosting provider): Paying for a well provisioned service to publish a much larger number of files, to some commercial users who buy big amount of solid bw.Comcast(commercial ISP): Altruisticly publish a small number of files from their home or work, to some common users, such as ADSL.
ISP Distribution
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Content Type
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Pb10
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12 Top is 7 times of All, Top-HP is 1.5 times of Top-CI
Average Downloaders Number
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Seeding Behavior
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Average Seeding Time per Content
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3 Types of Publishers
Fake Publishers: fake nature -> torrents unpopular -> seed all torrents + long time
Financial Publishers: relative long time torrents -> attract more users to download
Altruistic Publishers : publish + consume
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Incentives of Fake Publishers
Antipiracy Agents: publish fake versions of copyrighted content.
Malicious Publishers: lead users to download a malware.
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Incentives of Financial Publishers
Private BitTorren Traker:
Posting advertisement in their web sites
Require a fee for VIP access that allows the client to download more contents.
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Incentives of Financial Publishers
www.pixsor.com
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Incentives of Altruistic Publishers
Publish small music and e-book files that require small amount of seeding resources.
Extensive description of the content.
Often ask other users to help with seeding the content.
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3%publisher:67% content
79% downloads
Fake: 30% content, 25%download others: 37% content, 54%download
Will BitTorrent survive as the most popularfile-sharing application without these publishers?
Will BitTorrent survive as the most popularfile-sharing application without these publishers?
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THANKS!