Thomas Shey
Legend
The Acquisition Tango. Once DC won the lawsuit, they were sitting pretty. The courts had pretty much said, anybody who was sufficiently Superman-like was an infringement, and by that point every comics company had tried their hand at a knockoff. So, there was a great sell-off, with DC acquiring other titles very cheaply from tiny comics companies that didn't want to get sued. It's not where they got all of their Superman knockoffs, but it's how they got a lot of them.
Though there obviously were some accepted "okay, you're primarily using it for parody purposes so if you don't push it we'll let it pass" cases such as the Squadron Sinister (or the much more obscure Champions of Angor at the other end).