Digital watermarking and fingerprinting applications for copy protection
AssigneeDigimarc Corporation
InventorKenneth L. Levy
Life of this patent
Estimating the term…
Abstract
Improved copy protection systems including copy once, personal computer (PC) buffer copy protection, and identifying different copy control systems are provided. A “copy once” protection system uses memory in a recording device to remember content or physical media IDs so that the same original content or media is not copied twice. A PC buffer copy protection system determines if there is a relationship between input and output buffers on a PC, or networked PCs, to determine if the content can be copied. Different copy control systems, such as DVD systems and Conditional Access (CA) TV systems, can use different copy control watermark keys or payloads to identify which type of copy control system should be implemented.
Claims25
A method of providing copy protection for protected media content on a computer system, the computer system comprising an output port and an associated output buffer, and an input port and an associated input buffer, said method comprising:
- analyzing first media content buffered in the output buffer;
- analyzing second media content buffered in the input buffer;
- and
- comparing the first media content buffered in the output buffer with the second media content buffered in the input buffer, wherein a copy operation is modified or disabled when the first media content and the second media content match or otherwise coincide.
A method of providing copy protection for protected media content on a computer system, the computer system comprising an output port and an associated output buffer, and an input port and an associated input buffer, said method comprising:
- obtaining first media content buffered in the output buffer;
- obtaining second media content buffered in the input buffer;
- and
- comparing the first media content buffered in the output buffer and the second media content buffered in the input buffer through correlation of the first media content with the second media content, wherein a copy operation is modified or disabled when the correlation of the first media content and the second media content indicates that the first media content and the second media content match or otherwise coincide.
A method of providing copy protection for protected media content on a computer system, the computer system comprising an output port and an associated output buffer, and an input port and an associated input buffer, said method comprising:
- obtaining first media content buffered in the output buffer;
- obtaining second media content buffered in the input buffer;
- compensating for a time delay associated with the second media content relative to the first media content;
- and
- comparing the first media content buffered in the output buffer and the second media content buffered in the input buffer through correlation of the first media content with the second media content, wherein a copy operation is modified or disabled when the correlation of the first media content and the second media content indicates that the first media content and the second media content match or otherwise coincide.
Dependencies are inferred from the claim text.