You could, but then it becomes even easier to capture without the adornment, practically defeating the purpose. You may be interested in watermarks that are in

You could, but then it becomes even easier to capture without the adornment, practically defeating the purpose. You may be interested in watermarks that are invisible to the human eye but are visible to spectral analysis. You can even encode data within this invisible watermark, and learn a modification that is resistant to various image manipulations and even resistant to lossy compressions, in research that goes back to 2001 and has seen interesting improvements with advances in DNNs, Transformers and Diffusion.