the water mark is a tracked based on each purchase. Number 1, Number 2, etc. She tracks who buys what and will know who leaked because every picture sent has a custom watermark. It's actually very very smart.
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DamnYankee75 commented
and if you try to use mspaint and black it out, Im betting she has the watermarks in different areas so blacking them out wont work either.
Could you send the privately maybe