Enhanced multi-level cryptographic transformations that secure electronic files are disclosed. The secured electronic files contain not only secured data but also security information. The security information includes cryptographic structure information, access rules and secrets (e.g., keys). The cryptographic...http://www.google.fr/patents/US7930756?utm_source=gb-gplus-shareBrevet US7930756 - Multi-level cryptographic transformations for securing digital assets
Multi-level cryptographic transformations for securing digital assets
