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Black & White lists
HotlinkBlocker support black & white lists referrers and user-agents. Lists has a priority over protection instructions so for example if some referrer is in white list it is always allowed irrespectively of protection method and other factors. Also black list has a priority over white list.
Lists supports simple text patterns with a wildcards - '?' and '*'. Also regular expression patternts are supported using the @regex syntax where '@' character simply indicates that a pattern should be treated as regular expression and regex is a regular expression itself.
By default empty referrers are rejected and it is a convenient way to enable it by adding '@^$' to the referrers white list. But we strongly recomment you not to do that or better use LINK protection method that is insensitive to the referrers.
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