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Re:Grand jury subpoena for Signal user data by zeveb on Tuesday October 04, 2016 @02:39PM (#12638077)
The Constitution states, 'no Bill of Attainder or ex post facto Law shall be passed'; to the extent that those executive agencies' enabling legislation permits ex post facto regulations, that legislation is unconstitutional.
Re:Grand jury subpoena for Signal user data by fweespeech on Tuesday October 04, 2016 @05:53PM (#12639844)
The Government can simply ban the use of that software without a license set at a future date (i.e. 1/1/2017).

New Regulation -> Future Date -> Ex post facto claims don't happen.

That is the process my original comment intended to imply.