Each SystemWeaver license key has an Expiration date. The key expires at 00.00 on the given date.
In the below example, there are 2 license keys - one that is expired and one that is not expired.
If any license key expires, the License status shown at the bottom of the swAdmin client will inform that "One or more licenses are not available. Activated users exceeds Total available licenses.".
All users who are assigned to an expired key will not be able to log in. In the above example, there are 3 activated users on the expired key that are affected by the expiration.
Users assigned to other license keys that are not expired, are not affected and will still be able to log in.