How to block Wget/PHP/Perl bots?

It is so easy to change user-agent string, so don't even bother. I don't
know how yahoo blocks all. Here is what they did it

Please try to user Perl's useragent even changed the useragent to Mozzila to
get this url http://news.yahoo.com

If I use IE, it takes me 5 seconds, but with perl, it takes me 15 minutes.
Yahoo is first sending a cookie, but there is more, because using LYNX it is
ok to view the page.

So, I hope I can implement something similar. I am thinking using Javascript
to test it, since all PHP/Perl/Wget will not activate javascripts.

However, when googlebot come, I goto welcome it.

So is there a way not to display content to googlebot and human eyes, but
block all PHP/Perl/Wget even when they id themselves as Mozzila?

Wow wrote:

 > If I use IE, it takes me 5 seconds, but with perl, it takes me 15 minutes.
 > Yahoo is first sending a cookie, but there is more, because using LYNX it is
 > ok to view the page.

Lynx does support cookies you know?

 > So is there a way not to display content to googlebot and human eyes,
 > but block all PHP/Perl/Wget even when they id themselves as Mozzila?

No.

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