Invalidity dossier
US 7073060
Data transmission system
Current assignee: Sony Corp
Added 9/23/2026, 1:20:28 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 7,073,060 B2 — "Data Transmission System"
Bibliographic data (as supplied): US 7,073,060 B2; application US 11/112,828, filed 2005-04-22; granted/publication date 2006-07-04; priority date 1999-04-13; anticipated expiration 2020-04-11; legal status "Expired – Lifetime." Inventors: Tomoyuki Asano, Yoshitomo Osawa, Teruyoshi Komuro, Ryuji Ishiguro. Original and current assignee: Sony Corp. Other version: US 2005/0204137 A1. Classifications include H04L9/08 (key distribution/management), G11B20/00086 (anti-piracy recording circuits), H04L63/0428 (payload encryption), and H04N21/4408 (video stream encryption).
Problem addressed: Copy-generation management using SCMS/duplication control information (for example, 2-bit codes: copy free, copy once allowed, copy prohibited) can be defeated if an attacker alters that information in a packet header in transit. The excerpt gives the example of "11" (copy prohibit) being changed to "10" (copy once allowed), after which the receiving unit would permit recording because it cannot recognize the data was originally copy-prohibited.
Stated purpose/object: To provide a data transmission system, method, transmitting apparatus/method, and receiving apparatus/method that can "reliably carry out copy generation management."
Plain-language scope (per the excerpt): At the transmitting unit, a cipher key is generated from three elements — (1) first information shared in secret between transmitting and receiving units, (2) second information derived from the data's duplication control information, and (3) third information that is time-change information shared between the units. Data is ciphered with that key, and control information based on the duplication control information and the time change information is added to the ciphered data. The receiving unit receives this, regenerates the key from the same three elements (using the received control information), and decodes the data. Because the key depends on the duplication control information, tampering with that information yields decryption failure.
Not established by this excerpt: The full claim set (no claims are quoted here), the detailed description of key-generation algorithms, dependent-claim limitations, or the complete specification. No litigation, ownership-transfer, validity, or prior-art conclusions are drawn.
Generated 10/1/2026, 9:53:11 PM
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Litigation summary
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Proceedings on file (0)
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No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
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Obviousness
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Extensions
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.