The ID is the unique primary-key for every profile in the main-database as well as for any profile in you DVD Profiler.
|012236109679||profile for "Terminator 2: Judgement day" (Region 1, United States)|
|9398710385090.2||profile for "The Adventures of Priscilla, Queen of the Desert (10th Anniversary Edition)" (Region 4, Australia)|
|I439975705DBD8005.21||profile for "Kung Fu Hustle" (Region 3, Hong Kong)|
|M36.6||profile for a manually added DVD from China|
|VD80O545Q88HG0001.5||an alternate profile for the "Blade Runner 2049" Blu-ray with the EAN 4030521748446 (Region 2, Germany)|
The ID is not directly visible inside the profiler, but it is present in the XML-Export.