"Cheating has generally been rampant at B-schools."

Shocked? See B-Schools Use Turnitin Software to Crack Down on Plagiarism

And note:

Even cheaters are turning to content tracking services. They want to make sure the writers they hire to pen their essays aren’t ripping somebody else off or selling the same product to multiple customers.

Query: are law firms that sell the same (patent) opinion more than once ripping off clients?