Methods for secure multi-enterprise storage

A method, comprising:

• receiving a data identifier (ID) associated with each of a plurality of files from multiple data providers;
• storing the data ID associated with each of the plurality of files to a database;
• identifying any duplicate data IDs in the database to determine if any of the plurality of files associated with the data IDs are non-confidential;
• querying one of the data providers which provided the file having the duplicate data ID to determine if the data provider wants to store the file having the duplicate data ID to a storage network;
• receiving a response from the data provider indicating whether or not to store the file having the duplicate data ID to the storage network;
• receiving one of the files having a duplicate data ID from the data provider;
• storing the file having the duplicate data ID to the storage network;
• and
• causing deletion of the file having the duplicate data ID that is stored to the storage network from a system of the data provider from which the file having the duplicate data ID was received,
• wherein the data ID is unique to each different file and is only duplicated when the files are duplicates of one another, and
• wherein the data ID is a cryptographic hash.