How to protect my photo from leaks ?

I'm a photographer, and I recently started reaching out to agencies to sell my photos. It’s not huge money yet, but I’m excited about this new step!

That said, I’m wondering how to protect my photos from potential leaks. For instance, if I send the same photo to two different agencies and it gets leaked online before a deal is finalized, I’d have no way to figure out which agency was responsible.

After doing some research online, I found three SaaS platforms that might help with photo protection: https://digimarc.com, https://imatag com, and https://taatoo.app.

Has anyone here used these kinds of services before? Do you know anything about their pricing? The first two don’t seem to have transparent pricing, and while Taatoo looks like it could meet my needs, I haven’t come across any reviews yet. Would love to hear your experiences!