I'm pretty sure some form of DNA$ check occurs. Most likely it is bundled into some of the bigger files on the blu-ray discs. So you'd probably have to extract those data files within those big files in order to get to the network checks and patch them.
Just wondered this last night lol, but forgot and you posted the question before me.
Perhaps sonys confident enough in their "firmware update" strategy that they left DNA$ out this time around. It did cause legit users some problems last gen.
I don't think they left it out. If you go to system settings and select one of the options where it scrolls copyright information on the screen, you will see further down the list that it has a DNAS copyright.
I'm sure they will pass some info along as the need arises, but I wouldn't be too worried about DNA$ as it if ever becomes an issue the raw source code on how the entire Authentication System works is in the proper hands... and if $ony updates it that isn't an issue either.