Invalidity dossier
US 10484749
Systems and methods for secure playback of encrypted elementary bitstreams
Current assignee: DivX, LLC
Added 9/22/2026, 4:48:57 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US10484749B2
Title: Systems and methods for secure playback of encrypted elementary bitstreams
Patent number / application: US10484749B2; application US16/136,170; published as US20190020928A1 (published 2019-01-17); granted 2019-11-19.
Inventor(s): Francis Yee-Dug Chan; Kourosh Soroushian; Andrew Jeffrey Wood.
Assignee / original assignee: Divx LLC (listed as current assignee and original assignee). The excerpt also lists reassignments as of 2019-03-08 involving Divx LLC, Sonic IP, Inc., and Divx CF Holdings LLC. The excerpt notes that listed assignees "may be inaccurate."
Key dates: Prior art date and priority date 2009-12-04 (both stated as assumptions, not legal conclusions); filing date 2018-09-19; publication date 2019-11-19; anticipated expiration 2030-11-15; legal status "Active." Prior-art keywords: frame, encrypted, key, video decoder, data.
Purpose and plain-language scope (from supplied text): The patent concerns secure playback of encrypted elementary bitstreams — i.e., protecting encrypted video data (elementary streams) so it can be decoded and played back securely. From the excerpt, it involves encrypted frames, keys, and a video decoder. Classifications place it in selective content distribution/VOD networking, client-server control signaling for authorization by transmitting keys (H04N21/63345), network security for confidential data exchange with protected payloads (H04L63/0428), media packetization/network streaming (H04L65/70), multiplexing additional data with video streams (H04N21/23614), and client-side demultiplexing of additional data and video streams (H04N21/4348). The excerpt does not include the claims, specification, or drawings, so the precise claimed scope and the specific mechanisms are not established here. Related family members mentioned: US11102553B2, US12184943B2, US20260122321A1.
What the excerpt does not establish: the actual claim language; technical details of encryption, key handling, or decoder architecture; advantages or embodiments; inventorship/ownership accuracy beyond the notice given; and any litigation, validity, or prior-art conclusions (not researched per instructions).
Source: https://patents.google.com/patent/[US10484749](/patent/US10484749)/en
Generated 10/1/2026, 9:54:23 PM
Cases on file (2)
Group view →Specific litigation cases in our database that name US patent 10484749. The free-form analysis below may also discuss cases beyond this list.
- DivX, LLC v. Samsung Electronics Co., Ltd. et al.filed Sep 10, 2020337-TA-1222U.S. International Trade Commissionterminated/settled
Defendants: Samsung Electronics Co., Ltd., Samsung Electronics America, Inc., Samsung Electronics HCMC CE Complex Co., Ltd., and 14 others
- DivX, LLC v. Realtek Semiconductor Corp. et al.filed Sep 9, 20201:20-cv-01202U.S. District Court for the District of Delawareterminated Jun 4, 2024dismissed without prejudice
Defendants: Realtek Semiconductor Corp., LG Electronics Inc., LG Electronics U.S.A., Inc.
Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
Current assignee: DivX, LLC
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
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.
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This patent in court (2)
2 tracked lawsuits name US 10484749.