EDD Software Licensing by Security IDs
Though only one security id might be licensed, a user can be move it from account to account by changing the active Security Id for a license by using a feature on your web provided by this plugin.
License: GNU General Public License v2
Requires PHP 5.3 or later and ‘mcrypt’ PHP extension must be installed.. It is tested with EDD up to version 2.8.10 and with WordPress versions up to 4.9