[stcredzero]

maybe in your rush you failed to regenerate the random seed?

Or, my initial thoughts, someone inside Sony did this maliciously?

As always, the human factor is the real weakness. (Key management by users and coders.) There are similar problems with RSA signatures on related numbers or selecting keys for IDEA block cipher and RC4 stream cipher, just to name a few. If you use crypto tools incorrectly, you actually put yourself in a somewhat weaker position than if you hadn't even tried. What you've essentially done is create "security theater" for the bad guys to dupe the unsuspecting with.