I'm still having a little trouble. Here's the definition of 'patent' from Merriam-Webster:
Main Entry: pat·ent Function: noun 1 : an official document conferring a right or privilege : LETTERS PATENT 2 a : a writing securing to an inventor for a term of years the exclusive right to make, use, or sell an invention b : the monopoly or right so gran
you know what? I've just realized it was a stupid question, because I thought that the word patent here relates in some weird metaphorical sense to students, but it doesn't. Sorry, Mr Pedantic, (as you can see I'm not pedantic at all) - sorry once again and thank you anyway