http://tornotdffnimkvhlt5jfnoggfgcy4qbetfgqcjuyzcbhydkqanob3yqd.onion/faq
Right. But, then again, you couldn't prevent the recipient from taking a screen capture or even memorizing the note. That's why Tornote doesn't try to protect the note contents from being copied. It only makes sure that the contents is never read, by anyone, before it reaches the recipient, and is never read by anyone afterward either.