Prior art

The Google Patents page for US patent 7203844, titled "Method and system for a recursive security protocol for digital copyright control," lists several prior art documents. The patent itself also mentions prior art systems in its "Description" section.

Here are some of the most relevant prior art citations for US patent 7203844, as identified in the patent document:

U.S. Patent No. 6,327,652

• Full Citation: U.S. Pat. No. 6,327,652
• Publication/Filing Date: Not explicitly stated in the provided text, but cited as prior art to US7203844 which has a priority date of June 20, 2002.
• Brief Description: The patent document mentions that prior art systems "utilize a few basic operational categories of digital data encryption and decryption technologies." Without the full text of US6327652, a specific description of its invention cannot be provided.
• Potential Anticipated Claim(s): The patent generally refers to "Prior art systems" that use basic encryption and decryption, and it is likely cited for its foundational concepts in digital data encryption and security protocols. This could potentially anticipate general aspects of digital data encryption, as mentioned in the preamble of claims, but not the recursive nature of US7203844's protocol.

U.S. Pat. No. 6,330,670

• Full Citation: U.S. Pat. No. 6,330,670
• Publication/Filing Date: Not explicitly stated in the provided text, but cited as prior art to US7203844.
• Brief Description: Similar to US6327652, the specific description is not available in the provided text. It is cited in the context of general digital data encryption and decryption technologies.
• Potential Anticipated Claim(s): Likely cited for general encryption and decryption principles, possibly touching on elements that are broadly understood in the field, but not the novel recursive elements of US7203844.

U.S. Pat. No. 6,412,070

• Full Citation: U.S. Pat. No. 6,412,070
• Publication/Filing Date: Not explicitly stated in the provided text, but cited as prior art to US7203844.
• Brief Description: Again, without the full text, a detailed description is unavailable. It is listed among patents representing prior art in digital data encryption and decryption technologies.
• Potential Anticipated Claim(s): This patent would likely be considered for general knowledge in the field of digital content protection and encryption.

U.S. Patent Publication No. 20020013772

• Full Citation: U.S. Patent Publication No. 20020013772
• Publication/Filing Date: Not explicitly stated in the provided text, but cited as prior art to US7203844. Given the publication number format, this would be a pre-grant publication from 2002.
• Brief Description: The specific details of this publication are not provided in the excerpt. It relates to existing digital data encryption and decryption technologies.
• Potential Anticipated Claim(s): This publication likely informs the general state of the art in secure protocols or digital content protection at the time of US7203844's filing.

U.S. Pat. No. 6,226,742

• Full Citation: U.S. Pat. No. 6,226,742
• Publication/Filing Date: Not explicitly stated in the provided text, but cited as prior art to US7203844.
• Brief Description: The provided text does not offer a specific description of this patent's content, other than classifying it within the realm of digital data encryption and decryption.
• Potential Anticipated Claim(s): This patent would contribute to the understanding of the general background and existing techniques in digital security.

U.S. Pat. No. 6,101,605

• Full Citation: U.S. Pat. No. 6,101,605
• Publication/Filing Date: Not explicitly stated in the provided text, but cited as prior art to US7203844.
• Brief Description: The specific details of this patent are not included in the provided text; it's grouped with other prior art patents in encryption.
• Potential Anticipated Claim(s): This patent likely covers fundamental encryption or digital rights management techniques relevant to the broader field.

"Architectural Support for Copy and Tamper-Resistant Software" by David Lie, et al.

• Full Citation: "Architectural Support for Copy and Tamper-Resistant Software, by David Lie, et al. (Proceedings of the 9th Annual Conference on Architectural Support for Programming Languages and Operating Systems aka ASPLOS-IX, Cambridge, Mass. 2000)"
• Publication/Filing Date: 2000 (Conference Proceedings).
• Brief Description: This is a non-patent citation, an academic paper discussing architectural support for copy and tamper-resistant software. This suggests a focus on hardware and software interactions for security, potentially involving secure execution environments or tamper detection. The patent mentions that embodiments of its security protocol are designed to protect code from disassembly and modification, which aligns with the subject of this paper.
• Potential Anticipated Claim(s): This paper could potentially anticipate aspects related to secure execution of code, tamper resistance, and the interaction of hardware blocks (like the I-Cache 130 or CPU execution unit 120) with secured code, as described in US7203844's detailed description. For instance, the discussion around the CPU execution unit 120 keeping track of registers 140 when executing secure code, or implementing secure hashing functions, might be informed by such academic work. It would be highly relevant to the "system" claims (Claims 7 and 20) in terms of architectural components for security.

It is important to note that the provided text emphasizes that the security protocol described in US7203844 focuses on recursive encryption and controlling the expression of copyrighted work, and distinguishes itself from prior art by encapsulating other security protocols and not making artificial distinctions between bitstream types. Therefore, while the cited prior art may disclose elements of encryption, the novelty of US7203844 likely lies in its recursive application and the specific methods of combining and re-encrypting decryption algorithms and bitstreams, as detailed in its independent claims.