Keysoft v. Amazon: Patent Infringement Action Dismissed With Prejudice After 269 Days
Keysoft, Inc. filed suit against Amazon.com, Inc. in the Delaware District Court, asserting US8271315B2 against Amazon’s Sponsored Display audiences product. The parties reached a stipulated dismissal with prejudice after 269 days, with each side bearing its own costs and attorneys’ fees — a resolution structure that forecloses any refiling by Keysoft.
Keysoft’s US8271315B2 Suit Against Amazon Ends in Prejudicial Dismissal
On February 26, 2024, Keysoft, Inc. filed a patent infringement action against Amazon.com, Inc. in the U.S. District Court for the District of Delaware before Judge Gregory B. Williams. The complaint asserted US8271315B2 — a patent directed to audience-targeting or user-profiling technology — against Amazon’s Sponsored Display audiences advertising product. Keysoft was represented by Young Conaway Stargatt & Taylor, LLP, while Amazon retained Morris, Nichols, Arsht & Tunnell LLP.
The case closed on November 21, 2024 — 269 days after filing — via a joint stipulation of dismissal with prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(ii). The stipulation specifies that each party bears its own costs, expenses, and attorneys’ fees. A with-prejudice dismissal operates as an adjudication on the merits, permanently extinguishing Keysoft’s ability to bring the same patent claims against Amazon in any future proceeding.
The 269-day timeline suggests the parties likely resolved underlying commercial or licensing tensions before any substantive judicial ruling — no claim construction, summary judgment, or trial record is publicly available. The mutual cost-bearing arrangement is consistent with a negotiated exit, possibly involving a private settlement, though the public record does not confirm any financial terms. What remains unknown is whether Keysoft retains enforcement rights against other parties or whether Amazon obtained a broader license to the asserted patent.
Filing to Dismissed with Prejudice in 269 days
269 days from filing to stipulated dismissal — shorter than the median D. Del. patent case, suggesting early resolution pressure
Dismissed with prejudice by stipulation: what the ruling means for both parties
Rule 41(a)(1)(A)(ii) stipulated dismissal explained
A dismissal under Fed. R. Civ. P. 41(a)(1)(A)(ii) requires a signed stipulation from all parties who have appeared. When entered with prejudice, it carries the legal force of a final judgment on the merits. No court order is needed — the filing itself closes the case. This is the procedural vehicle parties typically use when they have reached a resolution and want a clean, final exit from the litigation without further judicial involvement.
Voluntary, binding, finalKeysoft permanently barred from re-suing Amazon on this patent
By agreeing to a with-prejudice dismissal, Keysoft, Inc. surrenders any future right to assert US8271315B2 against Amazon.com, Inc. on the same or substantially similar grounds. This is a significant concession from the patent holder. Unless a private settlement compensated Keysoft, the dismissal represents a strategic retreat. Keysoft retains the right to enforce the patent against third parties not party to this stipulation, but cannot revisit Amazon.
Permanent bar on re-assertionAmazon secures permanent protection from this specific claim
Amazon.com, Inc. obtains a durable litigation shield: Keysoft cannot refile this action or assert US8271315B2 against Amazon’s Sponsored Display audiences product in any future proceeding. The no-cost-shifting arrangement means Amazon did not obtain a fee award, which is typical unless a court finds the case exceptional under 35 U.S.C. § 285. The absence of a declaratory judgment of invalidity means the patent itself survives — just not as a weapon against Amazon.
Protected, no fee award neededUS8271315B2 remains live — risk for other ad-tech players
The dismissal with prejudice resolves only the Amazon dispute. US8271315B2 is not invalidated and Keysoft retains enforcement rights against the broader market. Companies operating audience-targeting, programmatic display, or behavioural advertising platforms that have not been sued — or have not obtained a licence — should treat this patent as an active risk. The swift resolution may signal that Amazon negotiated a licence, which would be consistent with a confidential settlement underpinning the stipulation.
Patent survives; third-party risk remainsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Keysoft, Inc. | Company | Advertising technology patent holder — asserting US8271315B2 covering audience-targeting methodsSearch in Eureka ↗ |
| Defendant | Amazon.com, Inc. | Company | Amazon.com, Inc. — global e-commerce and cloud technology company; defendant re Sponsored Display audiencesSearch in Eureka ↗ |
| Plaintiff counsel | Adam Wyatt Poff | Attorney | Counsel for Keysoft, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Daniel G. Mackrides | Attorney | Counsel for Keysoft, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Jill M. Browning | Attorney | Counsel for Keysoft, Inc.Search in Eureka ↗ |
| Plaintiff counsel | Michael J. Fink | Attorney | Counsel for Keysoft, Inc.Search in Eureka ↗ |
| Plaintiff counsel | P. Branko Pejic | Attorney | Counsel for Keysoft, Inc.Search in Eureka ↗ |
| Plaintiff law firm | Young Conaway Stargatt & Taylor, LLP | Law Firm | Representing Keysoft, Inc.Search in Eureka ↗ |
| Defendant counsel | Jeremy A. Tigan | Attorney | Counsel for Amazon.com, Inc.Search in Eureka ↗ |
| Defendant law firm | Morris, Nichols, Arsht & Tunnell LLP | Law Firm | Representing Amazon.com, Inc.Search in Eureka ↗ |
| Presiding judge | Judge Gregory B. Williams | Judge | Delaware District CourtSearch in Eureka ↗ |
Official order — verbatim text
The stipulation’s language — ‘dismissed with prejudice with each party to bear its own costs, expenses, and attorneys’ fees’ — is precise and deliberate. The with-prejudice designation transforms a voluntary exit into a merits-equivalent judgment, permanently foreclosing Keysoft’s claims against Amazon. The mutual cost-bearing clause eliminates any prevailing-party inference, and the absence of a declaratory judgment means US8271315B2’s validity is neither confirmed nor denied. The public record is silent on any financial consideration exchanged between the parties.
US8271315B2 — Audience Targeting and User Profiling Technology
US8271315B2, filed under application number US10/533859, covers technology in the audience-targeting and user-profiling domain relevant to digital advertising systems. The patent’s assertion against Amazon’s Sponsored Display audiences product — a programmatic ad product enabling advertisers to reach audiences based on shopping signals and browsing behaviour — suggests the claims relate to methods or systems for identifying, segmenting, or serving advertisements to user-defined audience pools. The patent’s B2 designation confirms it has been examined through the grant process and has issued with full claim scope.
For the programmatic advertising and ad-tech sector, US8271315B2 represents a meaningful enforcement asset: it was considered viable enough to assert against one of the world’s largest digital advertising platforms. Amazon’s Sponsored Display audiences is a high-revenue product, making this a high-stakes assertion. Competitors offering similar audience-targeting, retargeting, or lookalike-audience capabilities — including demand-side platforms, retail media networks, and social advertising platforms — face a credible risk of assertion if Keysoft pursues a broader licensing campaign following the Amazon resolution.
Should your team run an FTO against US8271315B2?
If your product involves audience segmentation, behavioural targeting, display retargeting, or user-profile-driven ad serving, US8271315B2 warrants FTO analysis. The fact that it was asserted against Amazon’s Sponsored Display audiences — a mainstream programmatic product — signals the patent holder views its claims as broadly applicable. Retail media networks, DSPs, and programmatic advertising platforms operating in similar technical spaces should not assume the Amazon dismissal signals patent weakness or expiry of enforcement intent.
PatSnap Eureka’s FTO Search Agent can map the full claim scope of US8271315B2, identify prior art that may constrain those claims, and surface any continuation applications or related family members that could extend the risk horizon. Eureka can also track Keysoft’s broader portfolio and filing activity — giving your IP and R&D teams the intelligence to assess whether a design-around, licensing approach, or IPR petition is the appropriate response before a demand letter arrives.
Run a freedom-to-operate analysis on US8271315B2 to assess your product’s exposure
Run FTO in Eureka →Similar Patent Cases: Audience Targeting & Ad-Tech Disputes in D. Del.
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What this case signals for the ad-tech and programmatic advertising IP landscape
A fast-track dismissal with prejudice against a major platform like Amazon typically signals either licensing resolution or early recognition of litigation risk.
With-prejudice exits in D. Del. often mask private licensing terms
Stipulated dismissals with mutual cost-bearing in the District of Delaware — particularly those resolved in under nine months — are a well-established signature of confidential licensing settlements. Patent holders rarely surrender re-assertion rights without consideration. Competitors in the Sponsored Display or programmatic audience-targeting space should treat this outcome as a possible indicator that Keysoft is actively licensing US8271315B2.
US8271315B2 remains an enforcement tool outside this dispute
No invalidity finding was entered. No claim construction ruling narrowed the patent’s scope. US8271315B2 retains its full issued claim scope and can be asserted against any party not covered by the Amazon stipulation. Ad-tech companies running similar audience-segmentation or display retargeting products should conduct FTO analysis against this patent before assuming the Amazon case signals patent weakness.
Keysoft v Amazon.com — key questions answered
The case was dismissed with prejudice by joint stipulation under Fed. R. Civ. P. 41(a)(1)(A)(ii) on November 21, 2024 — 269 days after filing. Each party bears its own costs and attorneys’ fees. The dismissal permanently bars Keysoft from reasserting US8271315B2 against Amazon on the same claims.
A with-prejudice dismissal operates as a final adjudication on the merits. Keysoft, Inc. cannot refile this action or assert US8271315B2 against Amazon.com, Inc. on the same grounds in any future proceeding. The legal effect is permanent and equivalent to a court-entered judgment against refiling.
Keysoft alleged that Amazon’s Sponsored Display audiences product infringed US8271315B2. Sponsored Display audiences is Amazon’s programmatic advertising product that enables advertisers to target audiences based on shopping signals, browsing behaviour, and user engagement with Amazon properties.
No. The stipulated dismissal with prejudice does not include any ruling on the validity or enforceability of US8271315B2. No claim construction, summary judgment, or invalidity finding was entered. The patent retains its full issued scope and Keysoft may continue to enforce it against parties other than Amazon.
The public record does not disclose any financial terms. The stipulation states only that each party bears its own costs, expenses, and attorneys’ fees. The mutual cost-bearing structure and rapid resolution are consistent with a confidential private settlement, but this cannot be confirmed from available court filings.
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