> I think some software companies (at least in the US) have dedicated people
> whose only purpose is to research whether the company is breaking some
> software patents. And it's a full-time job.

Of course, in fact I would say *most* medium to large companies have at 
least one person to check this kind of thing.  It's not just software, if 
you are manufacturing and selling a physical product you also need to check 
you are not breaking some patent (unless you think it's fun to go back and 
redesign and retool everything), and of course this takes resource.  Things 
like wiring up LEDs in a certain way or screwing things together in a 
certain way are patented.

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