Methods and systems for providing a cost effective and robust security solution for shared files stored by file sharing software solutions are described herein. The methods and systems for generating a ledger associated with shared files, which may include scanning data received from applications associated with a number of client devices and from a cloud based scanner. An access manager may control file permissions granted to users based on requests for scan data from each user device requesting access to a shared file. A plurality of different scanning applications may provide data that is collected for each shared file to provide a diverse analysis of a shared file to increase user confidence in a file security status.