NuCypher is doing some really fun stuff in this space: https://www.nucypher.com https://www.nucypher.com Basically, you upload encrypted blobs to a P2P network

NuCypher is doing some really fun stuff in this space: https://www.nucypher.com https://www.nucypher.com Basically, you upload encrypted blobs to a P2P network, and you can issue special proxy-re-encryption keys to people that allows them to download the encrypted content, without revealing any of the content to people running the nodes (who store and replicate the data). You can also do really interesting things like revoking keys to remove access for people who haven't downloaded the blob yet.