Originally Posted by Phanx
"Blizzard may, at its sole and absolute discretion, allow the use of certain third party user interfaces"... but even that is located in a paragraph forbidding the use of "third-party software that intercepts, "mines", or otherwise collects information from or through the Game or the Service" so I'm not sure that "user interfaces" in that context actually even refers to addons.
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In most legal documentation, there is a difference between pre-compiled binaries ("Software") and "Source" code. These terms exist to describe different stages of a program's development. In this case, "Third-Party Software" refers to any external pre-compiled binary and "User Interfaces" refers to any external "Source" objects (scripts, artwork, sounds, etc.) that are to be used directly by Blizzard's addon system.
As a note, both "Software" and "Source" are covered by copyright law and in the case of "Source", even specific chunks of code can be individually copyrighted.