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Use case discussed here: https://ethereum.stackexchange.com/questions/43381/ipfs-conditional-access-control-through-ethereum-smart-contracts?rq=1

Flow: User visits site. ( list of books to download ) checkout of a book prompts MetaMask login or fortmatic ( which later prompts wyre ) each book has a struct in a contract with: nameHash, price ( in dollars ), ipfs address chainlink can be used to get current eth/usd rate. Could also have prices in eth on UI purchase maps address

Content owner/seller need to be able to upload, encrypt, and store files. NuCypher needs the access policy for each file. Re-encrypts files for each buyer. Buyer pays a contract and then gets an access policy for that file.