Decide if/how we want plausible deniability for the persistent volume

Originally created by @Dr_Whax on #11681 (Redmine)

Decide if we want it, research the legal perspectives, etc.

(At the Tails summit 2016, we added this task to our roadmap, but nobody could volunteer so this has no target version.)

Parent Task: #5929

Edited May 15, 2020 by DrWhax

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