Here is an article on patent law. The article mentions the tension between software and pharamceuticals company over patent rights. Ebay wants to lessen them because they feel that something like the amazon "one click" might have questionable patentable status. The pharma companies don't want the patent system to show cracks becasue they already have a tough time making money on their patented property.
Maybe the retail and the pharma stacks should have a legal compontnet. But since everyone has one, it probably doesn't belong in the stack. Maybe something in security, as in security of patented or intellecutual property.