Allow/deny image hotlinking with .htaccess

by 
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain\.com [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?otherdomain\.com [NC]
RewriteRule \.(gif|jpe?g|js|css)$ - [F,NC,L]

Will work, as this says.

“Refererr is not nothing, and referer is not matching mydomain and referer is not matching otherdomain.

If it were the case that you were trying to do the opposite (blacklist a set of domains from hotlinking) you’d do something like

RewriteCond %{HTTP_REFERER} ^http://(www\.)?baddomain1\.com [NC,OR]
RewriteCond %{HTTP_REFERER} ^http://(www\.)?baddomain2\.com [NC]
RewriteRule \.(gif|jpe?g|js|css)$ - [F,NC,L]

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