Electronics Telecommunications Research Institute v. Snap Inc

I. Executive Summary and Procedural Information

• Case Name: Electronics and Telecommunications Research Institute, et al. v. Snap Inc.
• Parties & Counsel:
  • Plaintiff: Electronics and Telecommunications Research Institute; University-Industry Cooperation Group of Kyung Hee University (Republic of Korea)
  • Defendant: Snap Inc. (Delaware)
  • Plaintiff's Counsel: Farnan LLP
• Case Identification: 1:26-cv-00918, D. Del., 07/27/2026
• Venue Allegations: Venue is asserted based on Defendant's incorporation in Delaware and alleged acts of patent infringement committed within the District.
• Core Dispute: Plaintiffs allege that Defendant's Snapchat platform, specifically its backend video processing services, infringes three U.S. patents related to the High Efficiency Video Coding (HEVC/H.265) standard.
• Technical Context: The technology concerns advanced video compression techniques that enable the efficient storage and transmission of high-quality digital video, a critical function for video-centric social media platforms.
• Key Procedural History: The complaint alleges the patents are essential to the HEVC standard and that Plaintiffs have made them available for license on reasonable and non-discriminatory (RAND) terms. Plaintiffs describe extensive but ultimately unsuccessful pre-suit licensing negotiations with Snap conducted through the Access Advance patent pool. The complaint also notes that a related patent survived a re-examination proceeding, and that Snap paused licensing discussions after a separate patent lawsuit was filed against it in Brazil by another licensor.

Case Timeline

Date	Event
2011-06-20	'416 Patent Priority Date
2011-07-01	'416 Patent inventors submit contribution JCTVC-F358 to JCT-VC
2011-12-23	'182 Patent Priority Date
2012-01-20	'182 Patent inventors submit contribution JCTVC-H0240 to JCT-VC
2012-04-16	'643 Patent Priority Date
2012-04-17	'643 Patent inventors submit contribution JCTVC-I0415 to JCT-VC
2017-11-22	Examiner's comments on '182 Patent during prosecution
2018-01-30	U.S. Patent No. 9,883,182 Issues
2018-07-10	U.S. Patent No. 10,021,416 Issues
2023-02-28	U.S. Patent No. 11,595,643 Issues
2023-11-24	Alleged date of Snap's knowledge of patents via HEVC Advance pool
2024-05-30	Re-Examination Decision finds validity of a related patent
2025-08-13	Access Advance allegedly contacts Snap to invite licensing
2025-11-21	Access Advance allegedly sends Snap a patent chart
2025-11-24	Alleged phone call between Access Advance and Snap
2026-01-15	Access Advance allegedly sends Snap draft licensing documents
2026-03-25	Access Advance allegedly informs Snap of Brazil lawsuit
2026-07-27	Complaint Filing Date

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 11,595,643 - "Encoding method and decoding method, and device using same"

• Patent Identification: U.S. Patent No. 11,595,643, "Encoding method and decoding method, and device using same," issued February 28, 2023.

The Invention Explained

• Problem Addressed: The patent's background section describes the challenge of efficiently handling luma (brightness) and chroma (color) signals in video coding, noting that the human eye is more sensitive to luma Compl. ¶52 '643 Patent, col. 1:44-48 Additionally, prior art methods for rearranging transform coefficients, such as zigzag scanning, did not adaptively select the best frequency transform (e.g., Discrete Cosine Transform (DCT) or Discrete Sine Transform (DST)) for the specific coding circumstances, limiting efficiency Compl. ¶55
• The Patented Solution: The invention proposes a method to improve encoding and decoding efficiency by adaptively selecting the frequency transform type. The selection depends on factors like the size of the video block being processed and its intra-prediction mode Compl. ¶56 For example, for a 4x4 luma block, the patent teaches that using DST for transforms in both horizontal and vertical directions improves efficiency for all intra-prediction modes Compl. ¶57 '643 Patent, col. 25:63-64 This adaptive approach aims to produce smaller video bitstreams Compl. ¶56
• Technical Importance: This adaptive transform selection was a significant advancement over prior, less flexible video coding techniques, improving compression efficiency, particularly for high-resolution video Compl. ¶58

Key Claims at a Glance

• The complaint asserts exemplary claim 2 Compl. ¶89
• The essential elements of independent claim 2 (a method for encoding) are:
  • deriving an intra prediction mode of a current block;
  • determining a scan type of the current block based on the intra prediction mode;
  • deriving residual coefficients based on the scan type;
  • determining a transform type to be a DCT or a DST; and
  • performing an inverse-transform on the residual coefficients based on the transform type, wherein when the block is 4x4 and a luma component, the inverse-transform uses DST in horizontal and vertical directions for all intra prediction direction modes and a planar mode.
• The complaint does not explicitly reserve the right to assert dependent claims for this patent but alleges infringement of "one or more claims" Compl. ¶84

U.S. Patent No. 9,883,182 - "Method and apparatus for setting reference picture index of temporal merging candidate"

• Patent Identification: U.S. Patent No. 9,883,182, "Method and apparatus for setting reference picture index of temporal merging candidate," issued January 30, 2018.

The Invention Explained

• Problem Addressed: In video compression, "merge mode" improves efficiency by reusing motion information from neighboring blocks. A key piece of this information is the reference picture index of a "temporal merging candidate." Prior art methods required this index to be derived from a "spatial merging candidate" (a neighboring block in the same frame), which had to be already coded or decoded Compl. ¶65 '182 Patent, col. 12:23-42 This created a processing bottleneck, as it prevented multiple prediction blocks within a single coding block from being processed in parallel, slowing down high-throughput applications Compl. ¶65
• The Patented Solution: The patent discloses methods to derive the reference picture index of a temporal merging candidate that do not depend on the processing status of other blocks within the same coding block, thereby enabling parallel processing Compl. ¶66 '182 Patent, col. 13:15-29 The solution involves setting the reference picture index of the temporal merging candidate to a fixed value (e.g., zero) while the reference picture index of the spatial merging candidate is determined normally Compl. ¶69 This breaks the dependency chain and allows for increased processing speed and efficiency Compl. ¶67
• Technical Importance: Enabling parallel processing for merge mode prediction was a significant technological improvement, increasing processing speed and reducing complexity, which is particularly beneficial for high-definition video applications Compl. ¶67

Key Claims at a Glance

• The complaint asserts exemplary claim 1 Compl. ¶99
• The essential elements of independent claim 1 (a method for decoding) are:
  • selecting a collocated picture and deriving spatial and temporal merging candidates;
  • generating a merging candidate list from those candidates;
  • determining a motion vector and reference picture index from the list;
  • obtaining prediction and residual samples; and
  • generating a reconstruct block, wherein "while a reference picture index of the spatial merging candidate is determined based on a reference picture of the spatial neighboring block, a reference picture index of the temporal merging candidate is set to a fixed value of zero."
• The complaint does not explicitly reserve the right to assert dependent claims but alleges infringement of "one or more claims" Compl. ¶94

U.S. Patent No. 10,021,416 - "Method, apparatus, and bitstream for generating reconstructed blocks using filter for intra prediction mode"

• Patent Identification: U.S. Patent No. 10,021,416, "Method, apparatus, and bitstream for generating reconstructed blocks using filter for intra prediction mode," issued July 10, 2018.
• Technology Synopsis: The patent addresses prediction errors and inter-block discontinuities that arise during conventional intra-prediction in video coding Compl. ¶75 The solution is an unconventional method of filtering prediction pixels, where the filter type and target region are determined based on the intra prediction mode, which improves coding efficiency for high-resolution video Compl. ¶76
• Asserted Claims: The complaint asserts exemplary claim 1 Compl. ¶109
• Accused Features: The accused features are Snap's services that encode bitstreams into H.265-compliant (HEVC) formats on its servers Compl. ¶104

III. The Accused Instrumentality

Product Identification

• The "Accused Services" are identified as Snap's applications and backend processes for the Snapchat product Compl. ¶3

Functionality and Market Context

• The complaint alleges that when a user posts a video "Story," it is uploaded to Snap's servers, where Snap uses codecs to transcode it into digitally compressed variants at different resolutions and bitrates Compl. ¶23 This process explicitly includes encoding video into the H.265 (HEVC) format Compl. ¶24 The complaint cites a Snap engineering blog post stating, "HEVC (H265) allows us to deliver the same video quality with a smaller bitrate," which Plaintiffs allege demonstrates Snap's practice of the Asserted Patents Compl. ¶24 The complaint includes a visual from this blog post showing a side-by-side comparison of a video frame encoded in H.264 versus HEVC, illustrating the improved quality at a lower bitrate achieved by the accused HEVC implementation Compl. ¶26 Plaintiffs assert that this technology is "critical to Snap's business, driving the efficiency and quality of the videos that help keep users engaged" Compl. ¶4

IV. Analysis of Infringement Allegations

The complaint references exemplary claim charts attached as exhibits for each asserted patent; however, these exhibits were not provided as part of the filing Compl. ¶90 Compl. ¶100 Compl. ¶110 Accordingly, the infringement allegations are summarized in prose based on the text of the complaint.

• '643 Patent Infringement Allegations
  The complaint alleges that Snap directly infringes one or more claims, including exemplary claim 2, by making, using, and selling the Accused Services Compl. ¶84 The infringing act is identified as Snap's "encoding of bitstreams into H.265-compliant (HEVC) formats on servers in the United States" Compl. ¶84 The theory of infringement appears to be that by implementing the HEVC video coding standard, Snap necessarily practices the patented method of adaptively selecting transform types for 4x4 luma blocks as recited in claim 2 Compl. ¶57 Compl. ¶90

• '182 Patent Infringement Allegations
  The complaint alleges that Snap directly infringes one or more claims, including exemplary claim 1, through its "decoding of bitstreams from H.265-compliant (HEVC) formats on servers in the United States" Compl. ¶94 The infringement theory is that Snap's HEVC-compliant decoding services necessarily perform the patented method for enabling parallel processing in merge mode Compl. ¶67 Compl. ¶100 This includes the key step of setting the reference picture index of a temporal merging candidate to a fixed value of zero under specific conditions, as recited in claim 1 Compl. ¶99

• Identified Points of Contention:

  • Standard Essentiality: A central point of contention may be whether the asserted claims are truly essential to the HEVC standard as implemented by Snap. The defense could argue that non-infringing alternatives exist within the standard, or that Snap's specific implementation does not practice every limitation of the asserted claims.
  • Scope Questions: The infringement allegations are tied directly to the HEVC standard. A key question will be whether compliance with the standard inherently requires performance of every limitation of the asserted claims. For example, regarding the '643 patent, does the standard mandate using DST for all intra prediction direction modes in 4x4 luma blocks as claim 2 requires, or are there alternative, non-infringing transform options available?
  • Technical Questions: For the '182 patent, a technical question is whether Snap's decoders actually implement the specific workaround of setting the temporal merging candidate's reference picture index to a "fixed value of zero" as claimed. Evidence of the precise operation of Snap's decoding software will be critical.

V. Key Claim Terms for Construction

• '643 Patent, Claim 2

  • The Term: "the inverse-transform is performed by using DST in horizontal and vertical transform directions, for all intra prediction direction mode and a planar mode of the current block"
  • Context and Importance: This limitation defines a highly specific condition for when and how the Discrete Sine Transform (DST) must be used. Practitioners may focus on this term because the infringement allegation hinges on whether Snap's HEVC implementation is not only capable of using DST but is required to use it for "all" specified modes for 4x4 luma blocks, without exception. Any optionality in the standard or in Snap's implementation could create a non-infringement argument.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification discusses the benefits of adaptively applying DST, stating it "can be applied selectively and adaptively depending on the size of a block" '643 Patent, col. 10:51-55 This language of capability ("can be") might be used to argue for a broader application beyond the strict conditions of the claim.
    • Evidence for a Narrower Interpretation: The claim language itself is highly specific, using the restrictive phrase "for all." The complaint emphasizes this "unconventional choice" as a key part of the invention Compl. ¶56 A defendant may argue that the term "all" must be strictly construed and that any deviation, even for a single mode, would fall outside the claim's scope.

• '182 Patent, Claim 1

  • The Term: "a reference picture index of the temporal merging candidate is set to a fixed value of zero"
  • Context and Importance: This limitation is the core of the patented solution for enabling parallel processing. The dispute will turn on whether Snap's accused decoders perform this exact step. The term "fixed value of zero" is precise and was highlighted by the patent examiner during prosecution as a key inventive element Compl. ¶71
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification discusses overcoming the technical challenge by either replacing a candidate block or "setting the reference picture index candidate derived from such a block to a fixed value" '182 Patent, col. 17:50-18:25 An argument could be made that "a fixed value" is the broader concept, even though the claim specifies "zero."
    • Evidence for a Narrower Interpretation: The claim explicitly recites "zero." The Examiner's comments quoted in the complaint specifically call out "a reference picture index of the temporal merging candidate is set to a fixed value of zero" as part of the claimed invention that is "significantly more than" an abstract idea Compl. ¶71 This prosecution history may be used to argue for a narrow construction limited to the value "zero."

VI. Other Allegations

• Indirect Infringement: The complaint alleges induced infringement for all three patents, asserting that Snap induces its partners and vendors to directly infringe Compl. ¶85 Compl. ¶95 Compl. ¶105 The allegations are based on Snap providing the means (the Accused Services) with knowledge of the patents and the intent that infringement will occur Compl. ¶85 Compl. ¶95 Compl. ¶105
• Willful Infringement: Willfulness is alleged for all three patents. The complaint bases this on pre-suit knowledge, claiming Snap was aware of the patents since at least November 24, 2023, due to its status as an HEVC Advance pool licensee, and was again notified via communications from Access Advance on November 21, 2025 Compl. ¶83 Compl. ¶93 Compl. ¶103 The extensive licensing negotiations detailed in the complaint are presented as further evidence that Snap "knew or should have known that its actions infringe" Compl. ¶87 Compl. ¶97 Compl. ¶107

VII. Analyst's Conclusion: Key Questions for the Case

1. Standard Essentiality vs. Implementation: A central issue will be one of technical necessity: does Snap's implementation of the HEVC/H.265 standard necessarily practice every limitation of the asserted claims, or does the standard (or Snap's version of it) provide for non-infringing alternatives? The case may turn on evidence distinguishing between what the standard permits and what it mandates.
2. Claim Construction and Functional Specificity: A key legal question will be one of definitional precision. Can the functional limitations-such as "performed by using DST... for all intra prediction direction mode[s]" in the '643 patent and "set to a fixed value of zero" in the '182 patent-be read to encompass any deviation? The outcome will likely depend on whether these terms are construed as absolute requirements or as exemplary embodiments of a broader concept.
3. RAND Licensing and Conduct: With Plaintiffs seeking a declaratory judgment of compliance with their RAND obligations, a major component of the case will be the commercial reasonableness of the licensing negotiations. The court will likely be asked to evaluate the conduct of both parties during the alleged good-faith negotiations to determine if Plaintiffs' offer was consistent with their RAND commitments and whether Snap engaged as a willing licensee.