# US 8,572,752 B2 · Method and device for rights management

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,572,752 B2
- Document ID: US8572752B2
- Status: Granted
- Kind: B2
- Application number: 12/158,713
- Filed: 2006-12-22
- Published: 2008-12-11
- Granted: 2013-10-29
- Earliest claimed: 2005-12-26
- Assignees: Koninklijke Philips N.V.
- Applicants: Fulong Ma; Jin Qu
- Inventors: Fulong Ma; Jin Qu
- Web page: https://patentgrep.com/patent/US8572752B2

## CPC

- H04L 63/10: {for controlling access to devices or network resources}
- 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]}
- H04L 63/12: {Applying verification of the received information (cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32)}
- H04L 63/0428: {wherein the data content is protected, e.g. by encrypting or encapsulating the payload}
- H04L 2463/101: applying security measures for digital rights management
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A method of rights management in a first device connected to digital data content, said first device comprising a right for accessing said digital data content and available state information for reflecting the state of use of said digital data content, said method comprising the steps of: —receiving by said first device a request for a state information from a second device; —comparing the content of said request with said available state information; —selecting said requested state information in said available state information according to the result of said comparing step; —transferring said requested state information to said second device via a communication channel; and—duplicating said fight to said second device.

## Claims

### Claim 1

A method of digital rights management in a first device of digital data content the first device is connected to least one second device via a communication channel, said method comprising acts of:
providing to said first device digital rights for accessing said digital data content and an available amount of access to said digital data content;
said first device:
receiving a request for a portion of the amount of access to the digital data content from second device;
when the requested portion of the amount of access is within said available amount of access,
deducting said requested portion of the amount of access from said available amount of access,
transferring said requested amount of access to aid second device via the communication channel,
duplicating said digital right for accessing said digital data content to said second device as a second digital right,
verifying, by said second device, that said second digital right and an amount of access by the second device are not modified without authorization,
deducting the amount of access used by the second device from said request amount of access to determine the part of said requested amount of access that is unused,
receiving back from said second device at least part of said requested amount of access that is unused by said second device, based upon results of the verification by the second device,
verifying, by the first device, that said right and said available amount of access are not modified without authorization, and
merging the part of said requested amount of access that is unused by the second device based upon results of the verification by the first device.

### Claim 2 (depends on 1)

The method of digital rights management as claimed in claim 1, wherein said first device comprises a right encryption key, and further comprising an act of:
transferring said right encryption key to said second device via said communication channel.

### Claim 3 (depends on 1)

The method of digital rights management as claimed in claim 1, further comprising an act of: transferring said digital data content to said second device via said communication channel.

### Claim 4 (depends on 1)

The method of digital rights management as claimed in claim 1, further comprising an act of: securing said communication channel.

### Claim 5 (depends on 1)

The method of digital rights management as claimed in claim 1, further comprising an act of: protecting the integrity of the available amount of access.

### Claim 6 (depends on 1)

The method of digital rights management as claimed in claim 1, further comprising an act of: protecting the integrity of said requested amount of access by said second device.

### Claim 7 (depends on 1)

A method of right management as claimed in claim 1, said method further comprising the step of: securing said communication channel.

### Claim 8 (depends on 1)

A method of right management as claimed in claim 1, said method further comprising the step of: removing said right from said second device.

### Claim 9

A first device far digital rights management of digital data content, the first device connected to at least one second device via a communication channel and comprising a digital right for accessing said digital data content and available amount of access to said digital data content, said first device comprising:
a receiving unit for receiving a request from the second device for a portion of the amount of access to the digital data content;
a comparing unit for comparing the requested portion of the amount of access with said available amount of access;
a selecting unit for when the requested portion of the amount of access is within said available amount of access, deducting said requested portion of the amount of access from said available amount of access;
a transferring unit for transferring said requested amount of access to said second device via the communication channel;
a duplicating unit for duplicating said digital right for accessing said digital data content to said second device as a second digital right;
a first verifying unit for verifying, by said second device, that said second digital right and an amount of access used by the second device are not modified without authorization;
a returning unit for returning from said second device at least a part of said requested amount of access that is unused by said second device based upon results of the first verification unit;
a receiving unit for receiving back from the returning unit of said device at least part of said requested amount of access that is unused by said second device;
a second verification unit for verifying that said right and said available amount of access are not modified without authorization; and
a merging unit for merging the part of said requested amount of access that unused by the second device with said available amount of access based upon results of the verification by the second verification unit.