Originally Posted by EULA, Section 2 Clauses D, E, F, G
D. use any unauthorized third-party software that intercepts, "mines", or otherwise collects information from or through the Game or the Service, including without limitation any software that reads areas of RAM used by the Game to store information about a character or the game environment; provided, however, that Blizzard may, at its sole and absolute discretion, allow the use of certain third party user interfaces;
E. modify or cause to be modified any files that are a part of the Game Client in any way not expressly authorized by Blizzard;
F. host, provide or develop matchmaking services for the Game or intercept, emulate or redirect the communication protocols used by Blizzard in any way, for any purpose, including without limitation unauthorized play over the internet, network play, or as part of content aggregation networks;
G. facilitate, create or maintain any unauthorized connection to the Game or the Service, including without limitation (a) any connection to any unauthorized server that emulates, or attempts to emulate, the Service; and (b) any connection using programs or tools not expressly approved by Blizzard; or