I'm not using to suggest unreasonable actions to subjects, I'm using that example as a clear example where the data is, itself, incriminating to possess or transact.

In this case you can replace it pretty easily with any sort of material that’s illegal to possess, such as intellectual property that you do not own the rights to.

I don't think this is helping your argument, especially on HN. "We need to end privacy to preserve Warner Brothers and Disney profit margins"?

(If I have a DRM encrypted file that I don't have the keys for, am I now committing two offences? Are law enforcement entitled to a free copy of the HDCP keys?)

That's not the point: s/DRM/any sort of "illegal" content/g. Note that I am not discussing (or providing my position on) whether it should be possible to own "illegal" content, I'm just clarifying txru's argument.