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?

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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

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!