Why does the content remain? Often, it is because the specific media—a Thai dub VHS, a TV spot from 1989, a radio interview with Ethan Hawke—falls into or orphaned media . The copyright holder hasn't monetized that specific format for decades. The Archive preserves it in the "Commons" under the argument that cultural preservation trumps commercial scarcity.
Unlike Star Wars or The Lord of the Rings , Dead Poets Society lacks an official extended universe. However, a dedicated community has assembled what they call the "DPS Archive." Key components include: Dead Poets Society Internet Archive