What software should be used to create a closed distributed encrypted serverless moderated library?

Question

Distributed Computing

Please recommend software for creating a private digital library.
Tasks:

1. Storage of large volumes (tens of terabytes) of text and media data;
   
2. Classification and data retrieval, metadata processing;
   
3. Pre-moderation or content moderation;
   
4. Distributed storage without a center or with a weakly expressed center;
   
5. Encryption of storage and transmitted information;
   
6. Centralized management with the ability to automatically adapt to the elimination of the control node;
   

General description: The
software is installed on users' computers. Each computer is allocated space for data storage. Stored data is duplicated on different computers. During installation, private and public keys of the library are created. By public keys, reading and commenting are available, by closed keys - content placement and its classification.
The environment of use is a circle of IT friends who want to have a shared library. At the same time, when one of the friends "drops out", the availability of information should be preserved. No one except a circle of friends should have access to the library (or its closed part).
To date, the library exists as a file archive on the server. This approach has a number of disadvantages:

• The system is sensitive to failures on the server;
  
• It is easy to disrupt the system by blocking the server;
  
• Classifying by the file system tree does not provide the necessary flexibility;
  
• There is no search for meta-information, except for the name and path in the tree;
  
• Access control is implemented at the network domain level;