I believe that the fraudulent nature of the filing would negate the NDA in these cases. If push came to shove the court would side with the individuals, after all, the only reason the trolls obtained their personal information was because the troll lied to a court in order to show they did something illegal. Prenda may argue that the "Alan Cooper" signature was not significant nor required to be on the declaration but by submitting it to the court they still represented a fraudulent document.
The fraud is not in the signature but in the submission of a document with a signature that they knew to be false.
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