Create a religious non–profit, the Order of Librarians. The Order of Librarians will assess the merit of the donated information for perpetual salvation. Digit

Create a religious non–profit, the Order of Librarians. The Order of Librarians will assess the merit of the donated information for perpetual salvation. Digital donations must be accompanied by some monetary amount. All copyrights and intellectual properties (patents, whatever new nonsense is created in the future) tied to the donated information are assigned to the Order of Librarians in perpetuity. The Order of Librarians is authorized to use the donated information in any way they see fit that helps perpetuate the information (so selling access to it, placing ads on it, whatever). And it must be a legitimate religious organization, with whatever rituals and hymns and methods and beliefs will be used by governments to decide what is or is not a religious organization. The central belief is something like the value of the documents is sacred and must be maintained. And yet there is nothing you can do to guarantee any of this would last a century, let alone 500 years. Look to the history of the Catholic Church, solely because it's one of the few (European) institutions that have outlasted various regimes over millennia. And even the Catholic Church has had "winners" and "losers" over the millennia, with various documents and books being retained while others have been intentionally purged.