The Spamhaus Register of Known Spam Operations (ROKSO) is a database of "hard-core spam gangs"—spammers and spam operations who have been terminated from three or more ISPs due to spamming. The ROKSO list is not a DNSBL; it is, rather, a directory of publicly-sourced information about these persons and their business and at times criminal activities.
The ROKSO database is nowadays part of the signup checking procedure of many of the major ISPs, ensuring that ROKSO-listed spammers find it difficult to get hosting. A listing on ROKSO also means that all IP addresses associated with the spammer (his other domains, sites, servers, etc.) get listed on the Spamhaus SBL as "under the control of a ROKSO-listed spammer" whether there is spam coming from them or not (as a preventative measure).
There is a special version of ROKSO available to Law Enforcement Agencies (for which LEAs need to apply for access) which gives access to data on hundreds of spam gangs, with evidence, logs and information on illegal activities of these gangs, too sensitive to publish in the public part of ROKSO.
Read more about this topic: The Spamhaus Project
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