[cd34]

This rule allows empty referrers:

RewriteCond %{HTTP_REFERER} !^$ [NC]

GrandmaScrotum, phew, that ruleset has been floating around the net for a long time, and, its got many common errors. First, there is a space missing before the P, so, it would never match this. The non-anchored match at the front and the floating match to end of string aren't needed either.

RewriteCond %{HTTP_USER_AGENT} ^.*DISCo\Pump.*$ [OR]

Would be better as:

RewriteCond %{HTTP_USER_AGENT} ^DISCo\ Pump [OR]

and I sort of changed these by putting:

RewriteCond %{HTTP_USER_AGENT} ^Mozilla
RewriteRule /* - [L]

In front of your list of rules.

However, I really question whether those rules really do much anymore, since many surfers pretend to be Mozilla anyway.

But, if you were going to do it:

RewriteEngine on
RewriteCond %{HTTP_USER_AGENT} ^Mozilla
RewriteRule /* - [L]

RewriteCond %{HTTP_USER_AGENT} ^Teleport [OR]
RewriteCond %{HTTP_USER_AGENT} ^Internet\ Ninja [OR]
RewriteCond %{HTTP_USER_AGENT} ^Aculinx [OR]
RewriteCond %{HTTP_USER_AGENT} ^Ants [OR]
RewriteCond %{HTTP_USER_AGENT} ^attach [OR]
RewriteCond %{HTTP_USER_AGENT} ^Backstreet [OR]
RewriteCond %{HTTP_USER_AGENT} ^BackWeb [OR]
RewriteCond %{HTTP_USER_AGENT} ^Bandit [OR]
RewriteCond %{HTTP_USER_AGENT} ^Buddy [OR]
RewriteCond %{HTTP_USER_AGENT} ^Burner [OR]
RewriteCond %{HTTP_USER_AGENT} ^Caitoo [OR]
RewriteCond %{HTTP_USER_AGENT} ^Collector [OR]
RewriteCond %{HTTP_USER_AGENT} ^Commander [OR]
RewriteCond %{HTTP_USER_AGENT} ^Copier [OR]
RewriteCond %{HTTP_USER_AGENT} ^Crawler [OR]
RewriteCond %{HTTP_USER_AGENT} ^Curl [OR]
RewriteCond %{HTTP_USER_AGENT} ^DA [OR]
RewriteCond %{HTTP_USER_AGENT} ^Devil [OR]
RewriteCond %{HTTP_USER_AGENT} ^DISCo\ Pump [OR]
RewriteCond %{HTTP_USER_AGENT} ^Down2Web [OR]
RewriteCond %{HTTP_USER_AGENT} ^Downloader [OR]
RewriteCond %{HTTP_USER_AGENT} ^DownloadIt [OR]
RewriteCond %{HTTP_USER_AGENT} ^Drip [OR]
RewriteCond %{HTTP_USER_AGENT} ^Eater [OR]
RewriteCond %{HTTP_USER_AGENT} ^eCatch [OR]
RewriteCond %{HTTP_USER_AGENT} ^Eclipt [OR]
RewriteCond %{HTTP_USER_AGENT} ^EirGrabber [OR]
RewriteCond %{HTTP_USER_AGENT} ^Enterprise [OR]
RewriteCond %{HTTP_USER_AGENT} ^Express [OR]
RewriteCond %{HTTP_USER_AGENT} ^Extractor [OR]
RewriteCond %{HTTP_USER_AGENT} ^EyeNetIE [OR]
RewriteCond %{HTTP_USER_AGENT} ^FairAd\ Client [OR]
RewriteCond %{HTTP_USER_AGENT} ^FileHound [OR]
RewriteCond %{HTTP_USER_AGENT} ^FlashGet [OR]
RewriteCond %{HTTP_USER_AGENT} ^FlashSite [OR]
RewriteCond %{HTTP_USER_AGENT} ^FlipBrowser [OR]
RewriteCond %{HTTP_USER_AGENT} ^Get [OR]
RewriteCond %{HTTP_USER_AGENT} ^Go-Ahead-Got-It [OR]
RewriteCond %{HTTP_USER_AGENT} ^gotit [OR]
RewriteCond %{HTTP_USER_AGENT} ^Go!Zilla [OR]
RewriteCond %{HTTP_USER_AGENT} ^Grabber [OR]
RewriteCond %{HTTP_USER_AGENT} ^Grab [OR]
RewriteCond %{HTTP_USER_AGENT} ^Grafula [OR]
RewriteCond %{HTTP_USER_AGENT} ^Greed [OR]
RewriteCond %{HTTP_USER_AGENT} ^HMView [OR]
RewriteCond %{HTTP_USER_AGENT} ^Hoover [OR]
RewriteCond %{HTTP_USER_AGENT} ^HtGet [OR]
RewriteCond %{HTTP_USER_AGENT} ^HTTrack [OR]
RewriteCond %{HTTP_USER_AGENT} ^IBrowse [OR]
RewriteCond %{HTTP_USER_AGENT} ^iFox98 [OR]
RewriteCond %{HTTP_USER_AGENT} ^IGJpg$ [OR]
RewriteCond %{HTTP_USER_AGENT} ^InterGET [OR]
RewriteCond %{HTTP_USER_AGENT} ^InternetLinkAgent [OR]
RewriteCond %{HTTP_USER_AGENT} ^IPhoto [OR]
RewriteCond %{HTTP_USER_AGENT} ^iwantmy [OR]
RewriteCond %{HTTP_USER_AGENT} ^JetCar [OR]
RewriteCond %{HTTP_USER_AGENT} ^JOC [OR]
RewriteCond %{HTTP_USER_AGENT} ^JustView [OR]
RewriteCond %{HTTP_USER_AGENT} ^Keepoint [OR]
RewriteCond %{HTTP_USER_AGENT} ^leech [OR]
RewriteCond %{HTTP_USER_AGENT} ^lftp [OR]
RewriteCond %{HTTP_USER_AGENT} ^likse [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^Magnet [OR]
RewriteCond %{HTTP_USER_AGENT} ^Mag-Net [OR]
RewriteCond %{HTTP_USER_AGENT} ^Mass\ Downloader [OR]
RewriteCond %{HTTP_USER_AGENT} ^Memo [OR]
RewriteCond %{HTTP_USER_AGENT} ^MemoWeb [OR]
RewriteCond %{HTTP_USER_AGENT} ^MIDown\ tool [OR]
RewriteCond %{HTTP_USER_AGENT} ^Mirror [OR]
RewriteCond %{HTTP_USER_AGENT} ^Mister\ PiX [OR]
RewriteCond %{HTTP_USER_AGENT} ^MSProxy [OR]
RewriteCond %{HTTP_USER_AGENT} ^Navroad [OR]
RewriteCond %{HTTP_USER_AGENT} ^NearSite [OR]
RewriteCond %{HTTP_USER_AGENT} ^NetAnts [OR]
RewriteCond %{HTTP_USER_AGENT} ^NetDrag [OR]
RewriteCond %{HTTP_USER_AGENT} ^NetSpider [OR]
RewriteCond %{HTTP_USER_AGENT} ^Offline [OR]
RewriteCond %{HTTP_USER_AGENT} ^PageGrabber [OR]
RewriteCond %{HTTP_USER_AGENT} ^Papa\ Foto [OR]
RewriteCond %{HTTP_USER_AGENT} ^pcBrowser [OR]
RewriteCond %{HTTP_USER_AGENT} ^PerManSurfer [OR]
RewriteCond %{HTTP_USER_AGENT} ^PlantyNet_WebRo [OR]
RewriteCond %{HTTP_USER_AGENT} ^Pockey [OR]
RewriteCond %{HTTP_USER_AGENT} ^Pump [OR]
RewriteCond %{HTTP_USER_AGENT} ^Reaper [OR]
RewriteCond %{HTTP_USER_AGENT} ^Recorder [OR]
RewriteCond %{HTTP_USER_AGENT} ^ReGet [OR]
RewriteCond %{HTTP_USER_AGENT} ^Retriever [OR]
RewriteCond %{HTTP_USER_AGENT} ^SilentSurf [OR]
RewriteCond %{HTTP_USER_AGENT} ^Siphon [OR]
RewriteCond %{HTTP_USER_AGENT} ^Snagger [OR]
RewriteCond %{HTTP_USER_AGENT} ^Snake [OR]
RewriteCond %{HTTP_USER_AGENT} ^Snarf [OR]
RewriteCond %{HTTP_USER_AGENT} ^Snatcher [OR]
RewriteCond %{HTTP_USER_AGENT} ^SpaceBison [OR]
RewriteCond %{HTTP_USER_AGENT} ^Stripper [OR]
RewriteCond %{HTTP_USER_AGENT} ^Sucker [OR]
RewriteCond %{HTTP_USER_AGENT} ^SuperBot [OR]
RewriteCond %{HTTP_USER_AGENT} ^SuperHTTP [OR]
RewriteCond %{HTTP_USER_AGENT} ^Surfbot [OR]
RewriteCond %{HTTP_USER_AGENT} ^tAkeOut [OR]
RewriteCond %{HTTP_USER_AGENT} ^Vacuum [OR]
RewriteCond %{HTTP_USER_AGENT} ^Vampire [OR]
RewriteCond %{HTTP_USER_AGENT} ^wantmy [OR]
RewriteCond %{HTTP_USER_AGENT} ^Weazel [OR]
RewriteCond %{HTTP_USER_AGENT} ^Web [OR]
RewriteCond %{HTTP_USER_AGENT} ^WFARC [OR]
RewriteCond %{HTTP_USER_AGENT} ^Wget [OR]
RewriteCond %{HTTP_USER_AGENT} ^Whacker [OR]
RewriteCond %{HTTP_USER_AGENT} ^Widow [OR]
RewriteCond %{HTTP_USER_AGENT} ^WWWCopy [OR]
RewriteCond %{HTTP_USER_AGENT} ^WWWoffle
# whatever rule you want here.... block every request with the following rule
RewriteRule .* - [F]