Federal Circuit Affirms Unpatentability in DivX v. Unified Patents Adaptive Streaming Dispute

In a significant decision for the streaming technology sector, the U.S. Court of Appeals for the Federal Circuit affirmed the cancellation of DivX, LLC’s patent covering adaptive bitrate (ABR) streaming video encoding systems. Case No. 23-1699, closed on June 24, 2025 after 811 days of litigation, concluded with the Federal Circuit upholding an invalidity determination against U.S. Patent No. 10,326,987 B2 — a patent directed at systems and methods for encoding alternative streams of video for use in adaptive bitrate streaming.

The outcome carries meaningful weight for patent holders asserting streaming media patents against patent quality challengers, particularly in an era where Unified Patents, LLC has emerged as a prominent institutional force in inter partes review (IPR) proceedings. For IP professionals, in-house counsel, and R&D teams operating in the video streaming and codec space, this ruling underscores the vulnerability of broad software-implemented patents to patentability challenges before the USPTO’s Patent Trial and Appeal Board (PTAB) and the Federal Circuit.

Case Overview

The Parties

The Patent at Issue

This case involved a key patent covering foundational technology in modern streaming:

• • US 10,326,987 B2 — Claims systems and methods for encoding alternative video streams optimized for adaptive bitrate streaming.

Legal Representation

DivX was represented by Lowenstein & Weatherwax LLP, with attorneys Colette Woo, Kenneth J. Weatherwax, Nathan Nobu Lowenstein, and Parham Hendifar. Unified Patents retained Haynes & Boone LLP, with a team including David L. McCombs, Roshan Mansinghani, Adam Lloyd Erickson, Angela M. Oliver, Debra Janece McComas, and Jessica Leann Andersen Marks.

Litigation Timeline & Procedural History

The appeal was filed on April 5, 2023, in the District of Columbia circuit before the Court of Appeals for the Federal Circuit — the exclusive appellate forum for patent matters arising from PTAB decisions. The case closed June 24, 2025, reflecting a litigation duration of 811 days, approximately 27 months.

This duration is consistent with Federal Circuit appeals originating from PTAB invalidity proceedings, which typically involve extensive briefing, potential oral arguments, and deliberation periods. The underlying PTAB proceeding — likely an inter partes review initiated by Unified Patents — would have preceded this appellate record, meaning the total challenge lifecycle likely extended well beyond the 811-day appellate window.

The appeal centered on the PTAB’s patentability determination, with DivX challenging the Board’s findings on appeal. The verdict cause is classified as an Invalidity/Cancellation Action, and the basis of termination is recorded as Unpatentable — confirming that the Federal Circuit found no reversible error in the PTAB’s cancellation of the challenged claims.

The Verdict & Legal Analysis

Outcome

The Federal Circuit issued a per curiam or panel order affirming the PTAB’s final written decision, concluding: “THIS CAUSE having been considered, it is ORDERED AND ADJUDGED: AFFIRMED.” The patent claims at issue in U.S. Patent No. 10,326,987 B2 were confirmed unpatentable, effectively canceling DivX’s enforceable rights under that patent. No damages were at issue, as this was a validity challenge proceeding rather than an infringement suit. The affirmance also renders injunctive relief moot.

Verdict Cause Analysis

The verdict cause — Patentability — indicates the core dispute involved whether the claims of the ‘987 patent satisfied the statutory requirements for patentability, most commonly challenged grounds being anticipation under 35 U.S.C. § 102 or obviousness under 35 U.S.C. § 103.

Unified Patents’ litigation model consistently relies on prior art searches to identify references predating the challenged claims. In the adaptive bitrate streaming space, a robust body of prior art exists from standards bodies including MPEG-DASH, Apple HLS, and Microsoft Smooth Streaming, as well as academic literature and early commercial implementations. While the specific prior art references and claim construction positions adopted by the PTAB are not detailed in the provided case data, the Federal Circuit’s affirmance signals that the Board’s factual findings and legal conclusions were adequately supported by substantial evidence — the applicable standard of review for PTAB determinations.

The Federal Circuit’s affirmance without identified reversible error also suggests DivX’s appellate arguments — which might have included challenges to claim construction, the scope and content of prior art, motivation to combine, or secondary considerations of non-obviousness — were unpersuasive to the panel.

Legal Significance

This ruling reinforces several important legal principles:

• PTAB deference at the Federal Circuit: Factual determinations by the PTAB, including findings about the scope of prior art and motivation to combine, are reviewed under a substantial evidence standard — a high bar for reversal.
• Vulnerability of streaming technology patents: ABR and video encoding patents frequently face successful IPR challenges due to the availability of extensive prior art from standardization efforts and open-source development communities.
• Unified Patents’ institutional effectiveness: The outcome exemplifies Unified Patents’ track record of successfully invalidating asserted patents through coordinated PTAB challenges.

Strategic Takeaways

For Patent Holders (DivX and Peers): Adaptive streaming patents must be prosecuted with narrow, defensible claim sets that distinguish from published MPEG, HLS, and DASH standards documentation. Anticipate IPR petitions; design prosecution histories that preemptively address likely prior art combinations. Consider continuation strategies to maintain claim coverage even when individual patents face cancellation.

For Accused Infringers and Patent Challengers: Unified Patents’ model demonstrates the viability of preemptive IPR challenges before patent holders initiate district court litigation. Thorough prior art searches in video encoding literature — including IETF RFCs, ISO/IEC standards, and academic publications — remain a potent defense resource.

For R&D Teams: Engineering teams developing adaptive streaming pipelines should conduct freedom-to-operate (FTO) analyses referencing surviving DivX patents, as the cancellation of the ‘987 patent narrows — but does not eliminate — the company’s IP footprint. Document internal development timelines to support potential prior user rights defenses.

Industry & Competitive Implications

The affirmance in DivX v. Unified Patents arrives as adaptive bitrate streaming has become the dominant video delivery paradigm globally, with the market projected to sustain multi-billion-dollar growth through the decade. Patents covering ABR encoding and delivery systems have consequently become high-value licensing assets and litigation targets.

For DivX, the cancellation of the ‘987 patent represents a narrowing of its licensing leverage in negotiations with streaming platforms and device manufacturers. However, DivX maintains a broader patent portfolio, and the strategic impact depends significantly on whether the ‘987 patent’s claims were central to pending or contemplated licensing campaigns.

For the broader streaming industry, the ruling reinforces that patent quality challenges through PTAB — particularly those organized through entities like Unified Patents — remain an effective tool for companies seeking to neutralize licensing exposure without engaging in direct infringement litigation. This has a chilling effect on NPE (non-practicing entity) assertion strategies in the streaming space.

The case also signals continued Federal Circuit support for PTAB authority in resolving patent validity disputes — a dynamic that patent holders must account for when structuring IP portfolios in standards-adjacent technology areas.

Frequently Asked Questions

What patent was at issue in DivX, LLC v. Unified Patents, LLC?

U.S. Patent No. 10,326,987 B2 (Application No. 15/453,714), covering systems and methods for encoding alternative video streams for adaptive bitrate streaming.

What was the basis for the Federal Circuit’s affirmance?

The court affirmed the PTAB’s determination that the challenged patent claims were unpatentable, upholding the Board’s invalidity/cancellation findings under applicable patentability standards (likely anticipation or obviousness).

How does this ruling affect adaptive streaming patent litigation?

It reinforces the effectiveness of PTAB-based challenges against ABR streaming patents and signals that broad encoding claims lacking clear differentiation from prior art standards remain vulnerable to cancellation.