After you install Parallels Plesk Panel, a trial license key for 14 days is installed by default. To continue using Panel after the trial license key expires, you should obtain a lease license key or purchase a permanent license key.
A leased license means that you pay for a limited time during which you can use Panel, say, for a couple of months. During the lease period, Panel will perform free monthly updates of your license key. The lease license includes free upgrades to all major new versions of Panel.
The permanent license means that you buy a lifetime Panel license. A permanent license is updated every three months for free. Upgrading a Panel installation with a permanent license to the next major version requires a separate payment unless you use Software Update Service (SUS). See http://www.parallels.com/support/sus/ for more information on SUS.
Panel license keys have a grace period of 10 days before the expiration date. During the grace period, Panel makes daily attempts to update the license key automatically. If an automatic update fails, Panel notifies the administrator. If you do not update a license key during the grace period, it expires and blocks Panel functions until you install a valid license key.
Panel defines whether it needs to update the license key using the update-keys.php utility located in the $PRODUCT_ROOT_D/admin/plib/DailyMaintainance/directory, where the $PRODUCT_ROOT_D is /usr/local/psa for RPM-based systems or /opt/psa on DEB-based systems. This utility checks the license grace period and expiration date and tries to retrieve a new license key or blocks Panel.
Panel runs the utility every day as a part of the daily maintenance script. If you want to check for license updates, you can run the script manually by executing the command $PRODUCT_ROOT_D/bin/sw-engine-pleskrun $PRODUCT_ROOT_D/admin/plib/DailyMaintainance/script.php.
You can retrieve and manage license keys through the Panel GUI. The information about the current license key and controls for managing license keys are located in Server Administration Panel > Tools & Utilities > License Management.
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