Pictures (jpg's) can be edited by any picture edit program (like Photoshop). Protected pdf seems OK.
But there's nothing wrong with good old snail mail for legal purposes also.
Just recently we had a client alter an email sent by my business - now we are forced to prove that his copy of our email was not the original text. The only way I can figure to do this is to see if our ISP or his ISP has a record of the original email.
To prevent this in the future, I'd like to know what other business people do to create what is essential a read-only email. My lawyer sends protected PDF attachements. Is that the best way? Maybe generate a jpg of the text?
Any practical ideas are welcomed. Thank you