Open your .htaccess file in the root folder of the website. Add the below set of lines to it.
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^http(s)?://202.88.237.162 [NC]
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?docs.google.com [NC]
RewriteRule \.(doc)$ - [NC,F,L]
Using the google document embedded viewer
< iframe frameborder="0" src="http://docs.google.com/gview?url=http://http://www.domain.com/file.doc&embedded=true" style="height: 500px; width: 600px;">
If we use the above hotlink protection then the url http://http://www.domain.com/file.doc is not accessible directly. Only Google Document viewer can access the file.
