Patent ID: 8862876

Claim:
A computer system comprising: at least one non-transitory computer-readable medium having at least a first document, a second document, a plurality of decryption keys, and a plurality of data segments stored thereon, each of the plurality data segments being decryptable by a selected one of the plurality of decryption keys, wherein the plurality of decryption keys comprises a first set of decryption keys, each being associated with the first document and not associated with the second document, and a second set of decryption keys, each being associated with the second document and not associated with the first document; and a third set of decryption keys, each being associated with the first document and the second document; and at least one processor in operable communication with the at least one computer-readable medium, the at least one processor: deleting the first document; and in response to the deleting of the first document, rendering the first set of decryption keys unusable and not rendering the second set of decryption keys and the third set of decryption keys unusable.