If you've already replaced the Development License Key with the Basic License, and rebuilt the app, then I would suggest you do a complete uninstall of the previous app version from your device. Vuforia Engine stores a license key in the app's local file system and this may need to be deleted to remove the watermark.
Hello,
If you've already replaced the Development License Key with the Basic License, and rebuilt the app, then I would suggest you do a complete uninstall of the previous app version from your device. Vuforia Engine stores a license key in the app's local file system and this may need to be deleted to remove the watermark.
Thanks,
Vuforia Engine Support