Randsomeware, plausible deniability if the police demand your data under indefinite imprisonment?
Might have to have some abandoned randsomware ready to activate as a fallback solution to prevent the state from demanding I decrypt my data or they will be throwing me in jail indefinitely.
"Seriously Mr Policestate, I'd LOVE to be able to decrypt my data so you can mine it for information, however it seems that file I downloaded months ago was loaded with randsomeware from a criminal organisation that's long gone. There's no-one to pay to retrieve the key required to decrypt my data and I don't know what the password is either. I'm as gutted as you are about it Mr Policestate, honest I am Sir
But if you've got a spare 12 million years to try and crack it, could you provide a copy of the un-encrypted data once you have, I've foolishly not made any backups, and that would be fantastic of you.
Criminal scum eh. Pfft"