The paper doesn't seem to actually define their categories anywhere. Am I just missing it? Or am I meant to intuitively know the difference between "spied on / watched" and "spy / surveillance"?

Edit - upon re-reading, it seems like they're just using the themes present in the underlying literature, with _extremely_ conservative merging. Which makes the headline claim, that there are 37 distinct themes, pretty pointless. Is "spied on" really a distinct theme from "surveillance"? More likely, there's just no standardised name for it.