Some games have been removed those copy protection by original publisher.
Resources files in those re-released games are often 100% the same with the copy-protected one.

ScummVM only detect those resource files. There is no way to know where the player got those files, so ScummVM remove those copy protection for those specific-re-released-games.

For other games, you still need the original manual/code wheel/feelies.

Turn the manual to page 36 and enter the second word on line 7. Man, can't I just get on with my boss fight? :P

Yep, those were the days.

Heh. I didn't even know that, thanks!

Just informational, copy protection is (one form of) DRM.

DRM, digital rights management, is a broad term to cover publishers attempts to exert control over the product you buy. Copy protection is one of those control attempts. And yes, it does cover code wheels and manual lookups - the 'digital' part of DRM refers to the game, not the control method.

Sorry, this has been a public service announcement from the Pedantic Police. :)

I think I ended up with a bunch of page numbers and corresponding Imperial Star Destroy names memorized back in the day.

For years afterward whenever I'd play a 4X game, my vessels would be named like they were members of the Imperial Navy.