^ Glenday, Craig (2009). Craig Glenday (ed.). Guinness World Records 2009. GUINNESS WORLD RECORDS (paperback ed.). Random House, Inc. p. 241. ISBN 9780553592566. Retrieved September 18, 2009. Most popular MMORPG game(sic) In terms of the number of online subscribers, World of Warcraft is the most popular Massively Multiplayer Online Role-Playing Game (MMORPG), with 10 million subscribers as of January 2008.

Blizzard makes use of a system known as Warden on the Windows version of the game to detect third-party programs, such as botting software, allowing World of Warcraft to be played unattended. There has been some controversy as to the legality of Warden. Warden uses techniques similar to anti-virus software to analyze other running software on the players' PCs, as well as the file system. However, unlike most anti-virus software, it sends a portion of this information back to Blizzard, which caused privacy advocates to accuse it of being spyware.[122] One example of the information Warden collects is the title of every window open on the system while WoW is running.[123] On the other hand, many gamers responded positively to the development, stating that they supported the technology if it resulted in fewer cases of cheating. Blizzard's use of Warden was stated in the Terms of Agreement (TOA).[124]
Han pasado cinco años desde los eventos narrados en Warcraft 3. La Alianza y la Nueva Horda viven en un estado de guerra fría, y mantienen una frágil y quebradiza paz, mientras reconstruyen sus reinos y tratan de recuperar su prosperidad. En Ventormenta, el rey Varian Wrynn ha desaparecido en circunstancias misteriosas mientras viajaba en misión diplomática a la isla de Theramore, por lo que en su ausencia, es nombrado rey su hijo Anduin Wrynn, todavía un niño, asumiendo la regencia lord Bolvar Fordragon y la misteriosa lady Katrana Prestor. En Orgrimmar, el jefe de guerra Thrall lucha por sacar adelante a la Nueva Horda.
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