I am using pgp 10.1.0 on my mac. As i read the documentation you can use the software without licence if you are a single home user. See the part of EULA below:
PGP Desktop uses a licensing system to determine what features will be active. You enter your PGP Desktop license using the Setup Assistant after installation. If you are in a domain protected by a PGP Universal Server, your PGP administrator may have configured your PGP Desktop installer with a license.
You can also use PGP Desktop without a license, but for non-commercial use only. Commercial use of PGP Desktop without a license is a violation of the End-User License Agreement (EULA). If you choose to use PGP Desktop without a license (and you are legally permitted to do so under the EULA for non-commercial use), most PGP Desktop features will not work; only basic functionality will be available.
For more information about PGP Desktop licensing and purchase options, go to the PGP Store.
Hope it was helpful!