The Nitrokey Storage is not directly related to PureBoot. However, the Librem Key, which is used with PureBoot, is based on the Nitrokey Pro 2:
Nitrokey Partners with Purism to Build the Librem Key | Nitrokey
Unfortunately the Nitrokey Pro 2’s development has been discontinued, with the Librem Key still five versions behind upstream since its release:
Not sure, you will need to contact Purism for further details about their legal arrangements.
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