Data Signal with a Database and a Compressed Key

• US 20070143216A1
• Filed: 12/16/2005
• Published: 06/21/2007
• Est. Priority Date: 12/16/2005
• Status: Abandoned Application

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Inventors: Benaloh, Josh
• Application Number:
  US11/275,180
• Publication Number:
  US 20070143216A1
• Time in Patent Office: Days
• US Class Current: 705/51
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]

Abstract

Described herein are one or more data signal implementations having at least a database and a compressed key.

Claims

1. A content provider, comprising:

a database comprised of encrypted content;

a compressed key generator that generates a compressed key from which a first key can be derived to gain access to a first data subset of the database, and a second key can be derived to gain access to a second data subset of the database.

2. A computer-readable medium having computer-executable components comprising:

an encrypted database;

a compressed key generator that generates compressed keys associated with the encrypted database;

wherein a user can extract a key set that allows the user to decrypt a unique data subset of the encrypted database.

3. The computer-readable medium as recited in claim 2, wherein the compressed key generator further generates two or more compressed keys, wherein multiple users are each entitled to a compressed key that allows a user to decrypt a unique data subset of the encrypted database.

4. The computer-readable medium as recited in claim 2, wherein the compressed key generator further generates two or more compressed keys, wherein multiple users are each entitled to a compressed key that allows a user to decrypt a unique data subset of the encrypted database, each compressed key being encrypted so that only a user entitled to the compressed key can decrypt the compressed key.

5. A computer-readable medium having stored thereon a data structure comprising:

a first field containing an encrypted database;

a second field containing a compressed key from which a first key can be derived to gain access to a first data subset of the database, and a second key can be derived to gain access to a second data subset of the database;

a third field functioning to delimit the end of the data structure.

6. The computer-readable medium as recited in claim 5, wherein the first key can be derived by raising the random value, modulo the modulus, to the power of the product of the prime numbers in the prime set that are not in the prime subset.

7. A computer data signal embodied on one or more computer-readable media, comprising:

a code segment including instructions for generating an encrypted database embodied on a computer-readable media, the database having a first data subset and a second data subset;

a code segment including instructions for generating a compressed key from which a first key can be derived to gain access to the first data subset, and a second key can be derived to gain access to the second data subset.

8. The computer data signal as recited in claim 7, wherein the first key can be derived by raising the random value, modulo the modulus, to the power of the product of the prime numbers in the prime set that are not in the prime subset.