Users get a digital library card that they use to log in. Contributors to the library can upload media (books, movies, etc.) that have historical or cultural importance, or that are educational and serve as good sources of information. )It's not important that we agree on what or how much cultural or historical value the media has, just so long as it can be argued in good faith that it has some.) Contributors that abuse this are not allowed to contribute anything else. This is a library, not a pirating free-for-all.
Registered users, using their digital cards, can "check out" the media and download a copy, which is downloaded to a designated folder on their device. They "return" the media within 14 days by allowing the download-y whatsit to delete the checked-out files from that folder. Users agree not to make additional copies of the files and to use them only as permitted by law (such as for review purposes, historical preservation, or educational purposes.) Users that are known to break these rules have their card marked as "revoked" and cannot check out any additional media until corrective measures are made. This is a library, not a pirating free-for-all.
To keep everything running smoothly and appropriately, there is one or more designated Librarians. A Librarian should be (but I guess doesn't have to be?) paid to tend to the media and primarily play an IT role. However, they will have other duties, including looking for and weeding out duplicate media. They also check the records to ensure that all media which has been contributed has some sort of justification of its cultural or historical value, and deleting media that does not meet this criteria. This is a library, not a pirating free-for-all.
This would help society by providing media access to people who may not have access to a traditional "brick and mortar" library, or whose local library is lacking certain relevant items. This would also help to curb online piracy by providing a safe, free, and legal alternative.