Commentaire officiel

David, I just want you to understand that SERATO is the name of the COMPANY, not the product.
They have three versions of their software:
Intro
DJ
Scratch Live
If you purchase a DJ compatible hardware unit, it will unlock DJ or Intro.
If you purchase an Intro compatible hardware unit, it will only unlock Intro, DJ is a paid upgrade.
Scratch Live has limited availability as it is not designed for controllers; only certain mixers and audio interfaces can use SL.
When you purchased the DDJ-SB2, you paid for the ability to use Intro. If you want to have access to the features of DJ, as previously mentioned, it is a paid upgrade. If you have already purchased an unlock key for DJ then you can continue to use it without needing to purchase it again.
For the time being, you should be able to use Intro without any issues.