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Blizzard v. BnetD: Wikis


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From Wikipedia, the free encyclopedia

Original author(s) Mark Baysinger
Written in C
Operating system Linux, Windows
Type Server
License GNU General Public License

bnetd is a software package that was reverse engineered from Blizzard Entertainment's online multiplayer gaming service, providing near-complete emulation. The software allows users to create and play on their own servers, instead of servers. Released under the terms of the GNU General Public License, bnetd is free software.

Due to a United States lawsuit won by Blizzard against bnetd's original developers, they no longer maintain or host bnetd. It is currently being maintained by a Battle.Net user by the name of Punk (USEast Realm) as a standalone service. The log in sequence has been modified numerous times to match the current Battle.Net authentication.


CD key non-interoperability

Blizzard games are packaged with codes unique to each retail disk. CD keys are entered, but not verified, during the installation process. Connection to is permitted only with a valid and unique key. Individual keys are regularly disabled by administrators to block suspected cheaters from Players with invalid or disabled keys remain able to play independently of, such as in single player mode, or through a direct connection to another player.

Blizzard, citing security and piracy concerns on their webpage about emulation, does not allow to interoperate with bnetd servers to verify CD keys. Because of this, bnetd servers do not implement's validation. This allows players to access full multiplayer functionality of capable games without a valid CD key, by connecting to a bnetd server.

Blizzard takedown demand and lawsuit

In February 2002, Blizzard filed a DMCA safe harbor takedown demand against bnetd with their Internet service provider (ISP). Blizzard subsequently filed suit against the developers of bnetd and their ISP in the United States District Court for the Eastern District of Missouri. The lawsuit alleged copyright infringement, trademark infringement, and violations of their games' End User License Agreement (sometimes referred to as a clickwrap license) and DMCA anti-circumvention prohibitions, in what would become an important test case for portions of that law. The Electronic Frontier Foundation mounted a defense, in which defendants denied copying any portion of or Blizzard games, denied the validity of the trademark, denied that CD keys are an anti-piracy measure, and denied that bnetd is a circumvention tool.

In September 2004, the court disagreed and granted summary judgement to Blizzard. On appeal, defendants argued that federal copyright law, which permits reverse engineering, preempts California state contract law, upon which the EULA's prohibition on reverse engineering is grounded.

In September 2005, the Eighth Circuit Court of Appeals rejected the defendants' argument and affirmed the lower court's decision. "Appellants failed to establish a genuine issue of material fact as to the applicability of the interoperability exception [of the DMCA]. The district court properly granted summary judgement in favor of Blizzard and Vivendi on the operability exception." The appeals court further ruled that bnetd circumvents copy protection in violation of the DMCA.[1]

bnetd developer Ross Combs and EFF staff attorney Jason Schultz criticized the appeals court ruling, claiming the ruling means software and hardware vendors can use a DMCA-EULA combination to prevent otherwise lawful reverse engineering and chill the development of interoperable systems. Blizzard co-founder Mike Morhaime called the ruling "a major victory against software piracy." An Entertainment Software Association representative also supported the ruling, claiming it reinforces the DMCA's ability to prevent "IP abuse and theft."[2]

As a result of the litigation, the domain was transferred to Blizzard's control pursuant to the consent decree entered during the trial. As of April 2009, the domain continues to redirect to Blizzard's website. Although Blizzard won the case, the lawsuit did not stop the continued distribution of bnetd's open source, nor of derivative projects such as PvPGN. Other hosts were quickly set up by third parties in countries where no anti-circumvention legislation equivalent to the DMCA exists.

See also

  • PvPGN (Player vs Player Gaming Network) is a free and open source software project offering emulation of various gaming network servers and is being maintained by a non-profit organization.


External links



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