Steinberg + Arturia

I received the offer email with coupon code. The offer states that to qualify, you must own Cubase 5, Cubase Studio 5, Cubase Essential 5, Cubase LE / AI 5 or higher and Cubase Artist 6, Cubase Elements 6 or higher.

Problem is, I use Nuendo. Does anybody know… do they check for proof of ownership (e.g., ask for a Cubase serial number before purchase, have a special version that somehow works only on the Cubase host, or what)?

Seems odd (but not impossible) that I would receive the offer and be unable to redeem the coupon.

?