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htaccess is the only way you can block by referer, unless you move to more drastic measures such as blocking by IP range. This is more efficient since it can be done at the IP level (referer blocking requires a connect and some HTTP data to be exchanged before returning a 403 error) but there's more room for colateral damage.
For example, blocking 210.*.*.* is going to piss off a lot of Aussies and New Zealanders too.
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