PSN License Manager allows you to manage your PSN licencse.

Features:

Backup your PSN license.
Restore your PSN license.
Delete the backup license on the memory stick.
Toggle USB Mass Storage.
Up to 30 PSP support.

Licenses can only be used on ONE PSP!

http://forums.qj.net/psp-development-forum/155421-release-psn-license-manager-0-22-a.html