To stop hotlinking from specific outside domains only, such as myspace.com, blogspot.com and livejournal.com, but allow any other web site to hotlink images :

RewriteEngine On RewriteCond %HTTP_REFERER ^http://(.+\.) ?myspace\.com/ [NC,OR] RewriteCond %HTTP_REFERER ^http://(.+\.) ?blogspot\.com/ [NC,OR] RewriteCond %HTTP_REFERER ^http://(.+\.) ?livejournal\.com/ [NC] RewriteRule .*\.(jpe ?g|gif|bmp|png)$ http://i.imgur.com/qX4w7.gif [L]

You can add as many different domains as needed. Each RewriteCond line should end with the [NC,OR] code. NC means to ignore upper and lower case. OR means "Or Next", as in, match this domain or the next line that follows. The last domain listed omits the OR code since you want to stop matching domains after the last RewriteCond line.

You can display a 403 Forbidden error code instead of an image. Replace the last line of the previous examples with this line :

RewriteRule .*\.(jpe ?g|gif|bmp|png)$ - [F]