Originally Posted by WOW EULA
B. You agree that you shall not, under any circumstances,
(iii) host, provide or develop matchmaking services for the Game or intercept, emulate or redirect the communication protocols used by Blizzard in any way, including without limitation through protocol emulation, tunneling, packet sniffing, modifying or adding components to the Game, use of a utility program or any other techniques now known or hereafter developed, for any purpose, including without limitation unauthorized network play over the Internet, network play utilizing commercial or non-commercial gaming networks, or as part of content aggregation networks; or
(iv) facilitate, create or maintain any unauthorized connection to the Game or the Service, including without limitation any connection to any unauthorized server that emulates, or attempts to emulate, the Service. All connections to the Game and/or the Service, whether created by the Game Client or by other tools and utilities, may only be made through methods and means expressly approved by Blizzard. Under no circumstances may you connect, or create tools that allow you or others to connect, to the Game's proprietary interface other than those expressly provided by Blizzard for public use.