I cannot cite the reliable sources for it, though.
In terms of copyright terms, this software is still pretty young, not even halfway to public domain. It's disrespectful to call it "very old".
Surely if the work being protected isn't copyrighted, there's nothing to circumvent in terms of the DMCA?
Directive 2009/24/EC, Article 5 + Article 6
Under special circumstances it's legal within the EU do do this.
And removing a freaking old copy protection dongle to allow emulation of the software you legally are allowed to use falls under this.