What is a secure software I can upload video/photos to that embeds EXIF data to identify the user that re-uploads my content?

Asking this for a client -
I am in need of a software that users can sign up / be invited to. I upload a single image / video and each user that visits it has some type of unique data embedded in the image. It could even be a watermark with the username across the image.

The use case is if someone were to steal the data, we are able to identify the user and pursue legal …

asking can client cybersecurity data exif identify image photos secure software sign single software upload video what is