Does anyone know of a way photographers can protect their work from being stolen?

I’m doing a presentation next week and I am concerned. I did an initial shoot for these people and they took my picture to advertise that this property was coming soon. Wasn’t sure what to say to be honest. So I was hired to shoot the art for inside a new apartment building and it occurred to me after I send these files to be reviewed by the client… they could take them and use them and what could I do? Other than watermarking which is ridiculous and can be easily removed. Is there a way to protect my work. It would be great if there was something that I could use so no one could copy and download. Is there a way to block people from taking your work? Thank you