By f*** it's vague.

What it seems to boil down to is: Data is owned by users. File systems know which user owns which data no matter where it's stored. Don't you dare load this information into a relational database to provide a user-centric view of your data or we'll sue you.

It's official. Patent trolls have got to the stage where if you want to catalogue the contents of your sock drawer, you'd best check for patent infringement before loading your list of socks into a sodding database.....