You can check your license statuses by log in your Pioneer DJ Account "My Page".
1. Log in at one of Pioneer DJ web sites below with your Pioneer DJ Account.
2. Select "Licences" page
You will find your license status.
This case, you have activated your rekordbox dj license on a computer "PDJJP311" on 10 Feb, 2020.
When you deactivate your license on that computer, the information below will disappear.