We found that one page had been pirated by a client's competitor, that provided quite an indepth explanation of the reasons for the topics existence and cited by Wikipedia as the #1 outside reference.
The pirate had performed a simple company name replacement and changed the header. When we contacted him his excuse was that he had to start somewhere. I have heard this excuse many times when catching up with thieves... they believe that stealing is the only way to get started.
The client was very keen for justice, but when you look at the situation from an outside perspective you can see suing can cost a small fortune that won't be recompensed. It's always the backyarders who are the offenders, and they are not worth suing.