product key nRF52-dk ?

[Webmobi]

There is no product key on the package, there is only a sticker which is having the data nRF6827 , Rev.1

[Sigurd]

The nRF52-DK does not have a product key. Every resource is freely available for everyone. You can find all relevant software here and here. The documentation can be found at the Infocenter here.