@TremiRodomi
Regarding your edit here: https://www.pcgamingwiki.com/w/index.php?title=Konami_Collector%27s_Series:_Castlevania_%26_Contra&diff=1001809&oldid=1001608
Which region disc did you check?
The US release has SecuROM.
EDIT:
apparently there was only a US release.