Patent ID: 7447914

Claim:
A method, comprising: receiving at a user device one or more of a plurality of utilization permit keys, wherein said plurality of utilization permit keys includes: a first utilization permit key capable of use in cryptographic operations and configured to permit one or more of the following uses of digital data: displaying, editing, storing, copying, transferring; and a second utilization permit key capable of use in cryptographic operations and configured to permit one or more of the following uses of digital data: displaying, editing, storing, copying, transferring, wherein one or more uses permitted by the second utilization permit key are different from the one or more uses permitted by the first utilization permit key; and decrypting encrypted digital data using one or more of the received plurality of utilization permit keys that includes at least the first utilization permit key or the second utilization permit key for performance of only the use or uses of the digital data that are permitted by the received one or more utilization permit keys.