I don't know if this is what GP means but for one, Disney is one of the driving forces behind extending copyright periods:
The extension to life + 70, or 95 years after publication for corporate works, was in the 1998 Act. Disney did lobby for that, but the big argument for it was that was to match EU copyright terms, which went to life + 70 under the "Directive harmonising the term of protection of copyright and certain related rights" in 1993.