[pfx] email header questions

[Corey H via Postfix-users]

Authentication-Results: mxi-2.vivaldi.net;
	dkim=pass (2048-bit key; unprotected) header.d=xx.eu.org 
header.i=@xx.eu.org header.a=rsa-sha256 header.s=xx header.b=doqA0zf0;
        dkim-atps=neutral
for the DKIM header above, what do they mean by saying:

- unprotected
- dkim-atps=neutral

Thank you.
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