I want to start using online proofs, with a password protected page on my site for that client. But in this day and age even with a low res file, they can screenshot and use it for social media. How is the best way to use proofs online? Does one put a big watermark across it? That doesn't sound too appealing for the viewing which is the point of the proof but is the only method I can think of. What is the acceptable practice for this method?