I have a small publishing company that publishes, among other things, workbooks for elementary school. These workbooks are frequently copied and nowadays they are shared as pdf files on social media. In other words, the books hardly sell anymore. A few years ago, I received a Mercedes certificate of conformity via our car mechanic whereby the word 'copy' appeared when copying. After a long search I found out that it is a pantograph.
Can you make me a pantograph file (for black and white printing) 18 cm (landscape) that says 'illegal copy'? Can I then simply put that image on top of the layout in indesign, make pdf and have it offset printed or digitally printed? If there is a cost to create this image, I would love to hear from you.
I have no experience with TEX or something.