# License Model The QLM License Model field allows you to distinguish between 3 license models: * Trial: set this license model for trial versions of your application. A trial license is expected to expire after a given duration or on a specific date. * Subscription: set this license model for a purchased subscription of your application. A subscription license is expected to expire after a given duration or on a specific date. * Permanent: set this license model for a purchased version of your application. A permanent (or perpetual) license is expected never to expire. When creating a license, it is recommended that you set the License Model to permanent, trial or subscription. In the QLM Management Console, you can configure the default values of the Create Activation Key window by clicking Save Defaults once the window is opened. If you create a trial/subscription license key with expiry criteria, this license key cannot be converted into a permanent key simply by changing the License Model. QLM does not support converting a trial or subscription license to a permanent license. This is because expiry information is embedded in the license key. The License Model is typically used for logically grouping licenses. It is also used in the context of the following [Server Properties](/docs/qlm-license-server/server-properties.md): * enforceMaxTrialsWhenActivating * numberOfTrialLicensesAllowedPerClient Additional articles: * [How to limit the number of trial license keys a customer can use](/docs/how-to/how-to-limit-the-number-of-trial-license-keys-a-customer-can-use.md) * [How to follow up on idle trials with QLM Enterprise](/docs/email-framework/email-notifications/how-to-follow-up-on-idle-trials-with-qlm-enterprise.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.soraco.co/docs/fundamental-concepts/license-model-1.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.