The Licenses tab provides a list of individual license records that are automatically generated when users install your package in their orgs. Salesforce captures this action and creates the relevant details, including Lead information. This also contains the contact details of the organization and the person who performed the installation, as shown in the following screenshot:

From each of these records, you can modify the current license details to extend the expiry period or disable the application completely. If you do this, the package will remain installed with all of its data. However, none of the users will be able to access the objects, Apex code, or pages, not even the administrator. You can also re-enable the license at any time. The following screenshot shows the Details section: