Hello,
Thanks for your question about disallowing access to site backlinks. Search engines use robots to crawl your site. SEO - Search Engine Optimization - are techniques used to help sites appear better to search engines and therefore increase their search rankings. "Ahref" is HTML code for a link. So, it appears you're referring to separate website links. Websites are not the actual component that reads URLs or content on the internet. This is done by users through browsers or by automated software programs called robots/spiders. In general, you can use what's called a Robots.txt file to prevent companies from going through your website and indexing it. In terms of keeping a page on your website from being shared elsewhere - the simple answer is you can not do this. If you have a list of URLs on a page and it can be accessed from the web, then when that page is accessed, by its nature it can be read. Generally, the contents of a page cannot be selectively blocked from access when it's open to the general public. It is possible to do this through programmatic means, but you will need to speak with a developer for specifics on how this can be done.
If you have any further questions, please let us know.
Kindest regards,
Arnel C.