（ロボット検索避けタグ）

下記をソースのとの間に貼ってくらはい。ある程度は防ぐことができます。

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<meta NAME="ROBOTS" CONTENT="NOFOLLOW">
<meta NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
<meta NAME="ROBOTS" CONTENT="NONE">
<meta NAME="robots" CONTENT="noindex">
<meta NAME="robots" CONTENT="nofollow">
<meta NAME="robots" CONTENT="noindex, nofollow">
<meta NAME="robots" CONTENT="none">

<meta NAME="LIBWWW-PERL" CONTENT="NOINDEX">
<meta NAME="LIBWWW-PERL" CONTENT="NOFOLLOW">
<meta NAME="LIBWWW-PERL" CONTENT="NOINDEX,NOFOLLOW">
<meta NAME="LIBWWW-PERL" CONTENT="NONE">
<meta NAME="libwww-perl" CONTENT="noindex">
<meta NAME="libwww-perl" CONTENT="nofollow">
<meta NAME="libwww-perl" CONTENT="noindex,nofollow">
<meta NAME="libwww-perl" CONTENT="none">

<META http-equiv="robots" content="noindex">
<META http-equiv="robots" content="nofollow">
<META name="robots" content="noindex,nofollow">
<META name="ROBOTS" content="NOARCHIVE">
<META NAME="GOOGLEBOT" CONTENT="NOINDEX, NOFOLLOW">
<meta name="robots" content="noimageindex">
<meta name="robots" content="noindex,nofollow">