How to hide a landing page from spy tools?

[AliC]

Hi - is there a way to block spy tools from seeing a landing page?

I have been experimenting with monitoring $_SERVER['HTTP_REFERER'] in my PHP code, but very often this is blank or not sent - and is not reliable.

So is there a way to differentiate between sites such as Facebook and spy tool sites - both of which may be using the same landing page link?

Thanks

 

[healzer]

Do you know/have any of such spy tools?
If you do, you could try and reverse engineer them a little bit.
If you need some help, let me know, I could help looking into it as well.