How to hide a link for the user, but not for search engines?

Question

css

This is for when you copy the content of the site to yourself with an indication of the source.
How to make it so that the search engines never notice the difference?

Answer 1

The question is not clear.
If you just hide the link, then place it in a tag <span style="display:none;"></span>
. The search engine will see it, but the user will not.