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I don't know the answer to that question. But I will say this, if it is a binary data can be embedded that is not eBook related (i.g Amazon can put whatever data they want in it.)
If you wanted to remove any trace, you would have to scrub the file clean as in convert the MOBI to text, then use calibre to create a MOBI file.
But I am going to take the haughty road here and say don't do it it's just wrong. If s/he is not willing to fork over the cash then don't both with him.
Now if you say your going to "lend" him the book when your done reading it, well you don't really trust your friend that much do you since you have reservations about him deleting the book when their done reading it...right?
=X=
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