set/save a flag for hardware unlock

Rekordbox desktop and mobile apps:

Implement a feature that:

• When an authorized hardware controller (DDJ-FLX2, FLX-4, etc) is connected to the device running Rekordbox and the user has registered that hardware controller and logs in to Rekordbox, then
• The app then sets a flag and saves the the model/serial number to the user's account, recording the date activated 
• After 30 days the flag expires and the app checks for the registered controller, prompting the user to re-connect it to the authorized device and unlocks the app again.

I really enjoy using the app on my desktop to manage my entire music library while syncing to the iOS app on my iPad to play out, practice, listen to my playlists, set cue points, etc. I wish to do so with having to regularly dismiss an ad.