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+The Distributed Checksum Clearinghouses or DCC is an anti-spam content filter
+that runs on a variety of operating systems. The counts can be used by SMTP
+servers and mail user agents to detect and reject or filter spam or unsolicited
+bulk mail. DCC servers exchange or "flood" common checksums. The checksums
+include values that are constant across common variations in bulk messages,
+including "personalizations."
+
+Note that this installs three setuid binaries in /usr/bin.