- Imagine I have a document with confidential information (new technology, stock information, ...)
- I would like to send it to a couple of people for review
- They will all sign an NDA
- But someone leaks it
Suppose I can find the leaked version back, is there a way to sent it in such a way that I could trace and prove who leaked it?
I would imagine having to sent it to a third party who makes a unique version of the document (eg by hiding a key in some images) and who has asked the destination person to provide the key that makes it unique. This way they can certify that that person received that version and that he is the only one. He will also be the only one capable of opening the document if it is also encrypted. I will not be able to reproduce that document, so I can not falsely leak and accuse someone. And I have a third party witness.
Does such a service exist and how does it work?