Wow Gold -- Warden Client

Blizzard has made use of a special form of software known as the 'Warden Client'. When running, the client scans an individual's computer in order to verify compliance with the EULA/TOS. The Warden client is known to be used with Blizzard's World of Warcraft online game, and the Terms of Service contain a clause consenting to the Warden software performing these scans while World of Warcraft is running.

The Warden client scans the process names, window titles, and a small portion of the code segment of running processes in order to determine whether any of these third-party programs are running. This determination is made by hashing the scanned strings and comparing the hashed value to a list of hashes assumed to correspond to cheat programs. The Warden scans all processes running on a computer, not just the World of Warcraft game, and could possibly run across what would be considered private information and other personally identifiable information. It is because of these peripheral scans that Warden has been accused of being spyware and has run afoul of controversy among privacy advocates.

The Warden's reliability in correctly discerning legitimate vs illegitimate actions has been called into question due to actions Blizzard has taken regarding the information gathered by Warden. Most notably, that it appears that many players are reported as violating the EULA/TOS by the program, and subsequently banned, when in fact they are not cheating. A large scale incident happened when many Linux users were banned after an update to Warden caused it to incorrectly detect Cedega as a cheat program. Blizzard issued a statement claiming they had correctly identified and restored all accounts and credited them with 20 days play. Blizzard has regularly stated that the Warden sends no information, only a violation flag, to the home server. However, without specific information, having been sent by the Warden software initially, it would have been impossible for Blizzard to discern Cedega users from actual violators.

The Warden is not the first time Blizzard Entertainment has attempted to look at their customer's computers. In 1998 Blizzard Entertainment had a class action lawsuit filed against them for "unlawful business practices" for the action of collecting data from a user's computer without their permission.