Do a search for "copy protect web pages" and you will find solutions that cannot be exploited. Although the ones that are most effective do require a web browser specially designed for copy protection - then the only way anything can be copied is by using a camera to photograph the computer screen.

I could provide a link to a page that allows one to "copy protect any web page" and see how effectively it can be protected from all exploits, but the recommendation would not be allowed here.