When Zones are running with Solaris 10, the Deep Security Agent installation is only supported in global zone.
If you use the following command, it will install Deep Security Agent in both global and non-global zones:
# pkgadd -d Agent-Solaris_5.10_U7_sparc-7.5.0-5531.sparc.pkg all
To install the Deep Security Agent only in global zone, run the following command:
# pkgadd -G -d Agent-Solaris_5.10_U7_sparc-7.5.0-5531.sparc.pkg all
For more information, refer to this article: Install a Solaris agent.