So I suppose technically the CBC did pay for the documents... in that they hired Mr. Greenwald as a freelance journalist. I have no idea how many freelance journalist are on the CBC payroll but given the cutbacks and the fact that they can't send reporters everywhere they'd like, I suspect it is quite high. Still no less suspicious then the fact that he deposited the money in a bank local to where he lives, in a manor similar, I'm sure, to every other freelance journalist on the planet.
Of course this is par for the course for the Harper Government. If someone presents facts or evidence contrary to what they want the population to believe they discredit and then the cut financing.