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<object><abstract>   The Service Registration Protocol (SRP) for DNS-based Service
   Discovery (DNS-SD) uses the standard DNS Update mechanism to enable
   DNS-SD using only unicast packets.  This makes it possible to deploy
   DNS-SD without multicast, which greatly improves scalability and
   improves performance on networks where multicast service is not an
   optimal choice, particularly IEEE 802.11 (Wi-Fi) and IEEE 802.15.4
   networks.  DNS-SD Service registration uses public keys and SIG(0) to
   allow services to defend their registrations.
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