From: Cathal Garvey <cathalgarvey@cathalgarvey.me>
   >The question is not whether or not you can securely disclose that you
   >are under NSL. The question is whether you can do so without, when the
   >word breaks, being in trouble for leaking that information.
   >So yes, you can establish all sorts of wonderful contraptions that
   "get
   >the word out", publicly or privately, on or off-shore, so that the
   >people outside can disseminate warnings that you've been compromised.
   >But in the end, the stasi will blame you, and no matter how much
   >cooked-up legal convolution you wrap yourself in, they will nail you
   to
   >a cross.
       Generally, legally agents of a corporation cannot conspire with
   each other.   (Google:  'corporation cannot conspire with itself'
   [1]https://www.google.com/#q=corporation+cannot+conspire+with+itself
   )    Therefore, one possible tactic for a corporation that receives an
   NSL is to deliver a copy of that  NSL letter to each of its employees,
   including employees of all subsidiaries, naturally with a stern letter
   that they not disclose that to anyone else!   Obviously, that news will
   leak.  The government will 'know' that somebody, probably within the
   corporation, did the leak.  But given the size of the typical
   telecommunications company (thousands of employees), the actual
   source(s) of the leak(s) will be unknown.  Prosecution of any specific
   corporate employee will be difficult without very detailed evidence.
          The issue will arise:  Can a corporation legally deliver a copy
   of that NSL to each employee?  Well, each employee would probably be
   'imputed' (legally assumed) to know of such an order, even if they did
   not actually know of it.  Since they are legally obliged to comply with
   that order, it would be grotesque to not allow them to become actually
   aware of that specific order.  I think in the end the courts would have
   to agree that a corporation is entitled to inform each of their
   employees of the existence and content of the NSL.
              Jim Bell

References

   1. https://www.google.com/#q=corporation+cannot+conspire+with+itself