ICANN Acronyms and Terms
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Root Zone Maintainer(RZM)
The entity that accepts root zone data from the Root Zone Administrator, cryptographically signs the root zone data using the zone signing key, and places the signed data in the root zone distribution system. The RZM also serves as the Zone Signing Key Operator for the root zone.
Currently, Verisign serves as the RZM under contract with ICANN.