I've got the spanish edition of "El caballero oscuro: Edición 2 Discos" (UPC 7-321970-247534). There's no region symbols anywhere, neither the covers nor the discs. I suspect it is region free, as i have yet to find a Warner blu-ray region locked, but I'd better confirm the fact.

This main feature disc has got a Netherlands rating symbol (a "16" white number over a red background circle), so I believe it is safe to asume that the same disc is used in the spanish and the netherlands editions.

I've checked the profile for the netherlands edition, ("The Dark Knight", UPC 7-321906-176570), and it is submitted as region free. There are no notes about how the region was checked, though.

In a last ditch effort, I've also checked in http://bluray.liesinc.net/. All entries for "dark knight, the" for countries in the B region are listed as region free. No entries for Spain nor Netherlands though (which doesn't mean they are not region free, only that no one has submitted that info yet)

I feel like I'm "almost there", so here I am, asking if someone, somewhere, has been able to verify the region lock for the Spain/Netherlands blu-ray disc

Thank you all. Best regards.

They match, thanks for the idea!