Once the content that you have publicly provided via a web page has been accessed, you lose all ability to track how it has been used.
For example to remain untracked, some people use
wget to download a webpage which allows them to load it privately without anything being sent back to the server. The only useful information that the server can track is the access log of different files.
If you want to learn when are people snooping in to your code, you don't have any control over that.