Are Private Servers Legal

In most cases, private servers for massively multiplayer online games are unlawful due to the potential for copyright infringement, anti-circumvention, and violation of contract language. The 2005 case Davidson & Associates v. Jung established legal precedent for the publisher's position. The Nostalrius World of Warcraft private server shutdown in 2016 illustrated how unauthorized emulation and unauthorized access using Blizzard IP would be enforced.

In Davidson & Associates v. Jung (2005), the Eighth Circuit held that the bnetd project’s emulation of Blizzard’s Battle.net service circumvented Blizzard’s CD-key check and violated the DMCA’s anti-circumvention provisions.

The district court also found the defendants had breached the end user and Battle.net terms of use owned by Blizzard.

When those battles continued to play out in the years that followed, Blizzard's statements echoed the two principles: unauthorized use of the IP was a copyright issue, and using their authentication network breached their terms of use.

A specific example: These issues were framed as the justification for shutting down Nostalrius, a World of Warcraft private server that had been called a popular server hosted by its community-run team.

That shutdown came on April 10, 2016, following a cease-and-desist letter from Blizzard.

World of Warcraft executive producer J. Allen Brack later addressed the IP question: “The honest answer is, failure to protect against intellectual property infringement would damage Blizzard’s rights. This applies to anything that uses WoW’s IP, including unofficial servers.” He added that “there is not a clear legal path to protect Blizzard’s IP and grant an operating license to a pirate server.”

That discussion clarifies an important point about lawful efforts to recreate old game content: any authorization needs to go through the publisher, and a private server's operation itself may count as copyright infringement.

In practice, paid private servers often face more specific legal challenges.

The modern emphasis should match that: unauthorized use and monetization breach the terms of service and the relevant areas of copyright law. Operators of private servers, especially revenue-making servers, are operating in a high-risk zone.

For normal players, the question remains complex and must be carefully addressed. In principle, the establishment of unauthorized servers would be the liability of their operators, regardless of player involvement.

That still leaves the question of what liability a regular player might carry in addition to the operator group. Should a server operator add monetized access, or indulge in clear theft of the publisher's assets, that would be a clear violation beyond using the game with their client, and likely call for greater player care.

For now, the basic hold continues—that the enforcement has reinforced the developer/owner's claims on unauthorized use and monetization. Operators of those servers should be expected to incur specific legal challenges from the publisher, while players should be careful to check for signs of monetization and IP violations.