Great addition to GoG. Does this still require the copy protection code book in the manual or is it removed?

I am also interested in this information.

Yup, the copy protection seems to be missing.
Fortunatley, MOCAGH has a pdf scan of it -- cannot copy link directly, but go to:
www . mocagh . org / broderbund / uukrul-amulets.pdf

It's there in the installation folder in 2 files called "Amulets-1-2.jpg" and "Amulets-3-4.jpg".

The copy protection appears to be disabled anyway, so it doesn't really matter.

The codes were present in the addendum "Amulets" or something like that.
The GOG version offers them in two jpg files as it has been said before.
The game asks for the codes when you enter the sanctuaries to enable them, but apparently you can type anything and it does work. So If that's the copy protection you are referring to, then I can confirm it is disabled.
But I ignore if the game had any other different kind of copy protection present (non mentioning the spell names into the manual, of course).

Greetings

Thank you for your replies. Yes the copy protection that I meant was the amulent rings check in the sancturies. I am glad that it is disabled.

Thank you for the information.