Prior art

Here is the prior art information for US Patent 8667304, derived from the "Cited patents" section of the patent record on Google Patents.

The most relevant prior art for US patent 8667304, based on the citations listed, are primarily focused on conditional access systems and digital rights management.

Here are the details for each cited patent:

1. US8291236B2

• Full Citation: US8291236B2, "Methods and apparatuses for secondary conditional access server"
• Publication/Filing Date: Publication Date: October 16, 2012; Filing Date: December 7, 2004 (as U.S. application Ser. No. 11/007,116)
• Brief Description: This patent describes methods and apparatuses for a secondary conditional access (CA) server that bridges a primary security system (e.g., broadcast CA) with a secondary security system (e.g., a DRM system). The secondary CA server acts as a legitimate client of the primary system, recovers protected content, and provides new entitlement data and/or decryption keys consistent with original entitlements to secondary CA clients. It can handle delayed authorization and manage content for multiple clients. The patent explicitly states that US8667304 is a continuation of this application.
• Potential Anticipation (35 U.S.C. § 102): As US8667304B2 is a continuation of US8291236B2, the claims of US8291236B2 are effectively prior art to any claims in US8667304B2 that do not have the benefit of the earlier filing date for their subject matter. However, typically, a continuation patent like US8667304B2 is filed to claim subject matter disclosed in the parent application (US8291236B2) but not claimed in the parent. Therefore, this patent is highly relevant for all claims (independent claims 1, 13, 22, 24, 26) as it represents the fundamental groundwork and a substantial portion of the disclosure from which US8667304B2 derives. The detailed methods and apparatuses described in US8291236B2 for a secondary CA server managing entitlements and control words for secondary clients would directly anticipate or render obvious any identical or substantially similar claims in US8667304B2 that do not represent a patentable distinction over the parent's claims.

2. US20070186256A1

• Full Citation: US20070186256A1, "Method and apparatus for secondary conditional access server"
• Publication/Filing Date: Publication Date: August 9, 2007; Filing Date: December 7, 2004
• Brief Description: This patent application, with the same title and filing date as US8291236B2, also describes methods and apparatuses for a secondary conditional access server that bridges a primary security system and a secondary security system. It focuses on the server's role in recovering protected content and generating new entitlement data and/or decryption keys for secondary clients, potentially handling delayed authorization and broadcasting rights.
• Potential Anticipation (35 U.S.C. § 102): This is a published application related to the parent patent US8291236B2 and shares the same priority date. Its content is highly overlapping with US8291236B2, and thus similarly relevant to all claims (independent claims 1, 13, 22, 24, 26) of US8667304B2. Any claims in US8667304B2 that do not represent patentably distinct subject matter over the disclosure in this published application would be potentially anticipated.

3. US20060005230A1

• Full Citation: US20060005230A1, "Bridging two security systems using a virtual security device"
• Publication/Filing Date: Publication Date: January 5, 2006; Filing Date: July 1, 2004
• Brief Description: This application details systems and methods for bridging two security systems, where a "virtual security device" in one system is recognized as an authorized client in another. This virtual device performs authentication and decryption for content access across the two systems. It addresses scenarios where a content provider's primary security system interfaces with a secondary system, potentially enabling flexible content distribution to devices not natively supported by the primary system.
• Potential Anticipation (35 U.S.C. § 102): This reference is highly relevant to the core concept of "bridging" two security systems and a secondary server acting as an authorized client to a primary system, as described in independent claims 1 and 22 of US8667304B2. The concept of a secondary CA server representing a subscriber of a primary system (via a user key) and translating authorization for secondary clients aligns with the "virtual security device" described here. Thus, the fundamental architectural and functional aspects of a secondary CA server mediating access could be anticipated by this prior art. It could also impact dependent claims related to the server's role in authorization translation.

4. US20060184968A1

• Full Citation: US20060184968A1, "Methods and apparatuses for content protection using multiple key components"
• Publication/Filing Date: Publication Date: August 17, 2006; Filing Date: February 14, 2005
• Brief Description: This patent application describes methods and apparatuses for content protection that involve using multiple key components for encryption and decryption. It addresses scenarios where different keys are used for different parts of content or for different levels of access, enhancing security and flexibility in content distribution.
• Potential Anticipation (35 U.S.C. § 102): While not directly about a secondary CA server, this patent relates to the underlying mechanisms of content protection, specifically the use of multiple key components (e.g., control words, service keys) as mentioned in independent claims 1 and 22. It could potentially anticipate aspects of how keys are managed or utilized, especially if the claims of US8667304B2 delve into novel methods of key component usage that were already contemplated or disclosed in this document.

5. US20070204328A1

• Full Citation: US20070204328A1, "System and method for content transfer and playback"
• Publication/Filing Date: Publication Date: August 30, 2007; Filing Date: February 28, 2006
• Brief Description: This application describes a system and method for transferring and playing back protected content, particularly focusing on moving content between devices and maintaining associated rights. It addresses the challenges of digital rights management when content is not consumed on the original receiving device.
• Potential Anticipation (35 U.S.C. § 102): This prior art is relevant to the aspects of US8667304B2 that deal with distributing content to secondary CA clients for storage and later playback, as mentioned in the abstract and described in various claims (e.g., independent claim 13 and dependent claims referencing recording or storing content). Specifically, the concepts of managing rights and ensuring authorized playback when content is transferred could be anticipated by this document.

6. US7577839B2

• Full Citation: US7577839B2, "Methods and apparatuses for content protection using multiple key components"
• Publication/Filing Date: Publication Date: August 18, 2009; Filing Date: February 14, 2005
• Brief Description: This patent describes methods and apparatuses for content protection using multiple key components for encryption and decryption. It is related to US20060184968A1 and covers similar ground regarding flexible and secure key management in content protection systems.
• Potential Anticipation (35 U.S.C. § 102): Similar to US20060184968A1, this patent could anticipate aspects of key management and content protection schemes mentioned in US8667304B2, particularly those in independent claims 1 and 22 that describe the use of service keys and control words.

7. US7703126B2

• Full Citation: US7703126B2, "Bridging two security systems using a virtual security device"
• Publication/Filing Date: Publication Date: April 20, 2010; Filing Date: July 1, 2004
• Brief Description: This patent is the issued version of US20060005230A1. It describes systems and methods for bridging two security systems using a virtual security device, allowing a recognized device in one system to act as an authorized client in another. It enables a primary content provider to deliver content securely to a secondary system via this bridging device.
• Potential Anticipation (35 U.S.C. § 102): As the granted patent corresponding to US20060005230A1, this is also highly relevant to the core bridging functionality described in independent claims 1 and 22 of US8667304B2. Any claims in US8667304B2 that cover the fundamental aspects of a secondary CA server acting as a recognized client to a primary CA server to manage content access for secondary clients would be potentially anticipated by the teachings of this patent.

8. US7752646B2

• Full Citation: US7752646B2, "Method and system for controlled media content distribution"
• Publication/Filing Date: Publication Date: July 6, 2010; Filing Date: April 23, 2004
• Brief Description: This patent describes a method and system for controlled distribution of media content, particularly in a networked environment, with emphasis on managing access rights and usage policies.
• Potential Anticipation (35 U.S.C. § 102): This prior art is relevant to the broader context of controlled media content distribution, especially within networked environments, and the management of access rights. It could potentially anticipate aspects of independent claims 1 and 13 relating to the transmission of "access controlled data" in an "access controlled format" (e.g., DRM).

9. US7966628B2

• Full Citation: US7966628B2, "System and method for content transfer and playback"
• Publication/Filing Date: Publication Date: June 21, 2011; Filing Date: February 28, 2006
• Brief Description: This patent is the issued version of US20070204328A1. It describes a system and method for transferring and playing back protected content, focusing on maintaining rights and authorization when content is moved between different devices or storage locations.
• Potential Anticipation (35 U.S.C. § 102): As the granted patent corresponding to US20070204328A1, this patent is relevant to the aspects of US8667304B2 concerning content recording, storage, and delayed playback, as outlined in independent claim 13 and various dependent claims. Specifically, the mechanisms for ensuring rights management during content transfer and later playback could be anticipated.

Important Note on Anticipation:
Determining whether a patent anticipates a claim under 35 U.S.C. § 102 requires a detailed, element-by-element comparison of the claim with the disclosure of a single prior art reference. This analysis is complex and often involves legal interpretation. The descriptions above highlight the potential relevance of each prior art document based on their abstracts and the general subject matter, indicating areas where overlap with US8667304B2's claims might exist. A definitive statement of anticipation would necessitate a full legal review.

• US8291236B2 and US20070186256A1 are particularly strong references as US8667304B2 is a continuation of the former and the latter is a related publication. Their disclosures are very likely to anticipate or at least render obvious many of the specific implementations claimed in US8667304B2, assuming those claims are not patentably distinct from what was already disclosed in the parent application.
• US20060005230A1 and US7703126B2 are also highly relevant as they address the core concept of bridging security systems with a "virtual security device" which mirrors the function of the secondary CA server described in the independent claims.