22 lines
1.2 KiB
Text
22 lines
1.2 KiB
Text
The Distributed Checksum Clearinghouses or DCC is an anti-spam content
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filter that runs on a variety of operating systems. The counts can be
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used by SMTP servers and mail user agents to detect and reject or filter
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spam or unsolicited bulk mail. DCC servers exchange or "flood" common
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checksums. The checksums include values that are constant across common
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variations in bulk messages, including "personalizations."
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The DCC software is distributed under a license that is free only to
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organizations that participate in the global DCC network. ISPs that use
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DCC to filter mail for their own users are intended to be covered by the
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license. You can redistribute unchanged copies of the DCC source, but
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you may not redistribute modified, "fixed," or "improved" versions of
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the source or binaries. You also can't call it your own or blame anyone
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for the results of using it.
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Organizations selling anti-spam appliances or managed mail services are
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not eligible for the free license.
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The DCC client programs are configured to use the public DCC servers by
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default. You should use these if your mail system handles fewer than
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100,000 messages per day. If your system handles more than that, you
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should run your own local DCC servers as part of the global network.
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