When HBO first launched way back in 1972, it wasn't seen as a very big deal. Pay cable TV networks were still uncommon at the time, and they weren't very profitable. The idea behind pay-TV is common now — pay a subscription fee for access to high-end sporting events and uncensored, ad-free Hollywood movies — but at the time, it was seen as an extravagance. It certainly didn't help that movie theater owners and major TV networks heavily campaigned against networks like HBO, which they saw as a minor threat. HBO used modern tech to innovate, however — they were...