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Do any ebooks offer full disk encryption?

Remarkable is meant to hold all your notes, books, any such textual data. Ebooks are only one small part of its intended usage.

I know. The question stands.

I don't think so.

What does a book e-reader have to do with the ReMarkable though? Why does that question still matter?

No, but many ereaders at least provide a pin code lock which the rm2 does not.