PACSEC3 v. Alibaba Cloud: Infringement Action Dismissed With Prejudice in 83 Days
PACSEC3, LLC asserted US7523497B2 against Alibaba Cloud US, LLC in the Northern District of California, targeting AliCloud and Alibaba.com. The case ended in a voluntary dismissal with prejudice in just 83 days — before Alibaba Cloud filed any answer — with each party bearing its own costs.
A fast-closing assertion against Alibaba Cloud that ended on plaintiff’s own terms
On August 12, 2025, PACSEC3, LLC filed a patent infringement action in the U.S. District Court for the Northern District of California against Alibaba Cloud US, LLC, asserting U.S. Patent No. 7,523,497 in connection with the AliCloud and Alibaba.com platforms. The case was assigned to Judge Jon S. Tigar. PACSEC3 is represented by David John Hoffman and Jennifer L. Ishimoto, while Alibaba Cloud retained a five-attorney team from Troutman Pepper Locke LLP.
The action terminated on November 3, 2025, when PACSEC3 filed a notice of voluntary dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(i), specifying that dismissal was with prejudice as to the asserted patent. Critically, the dismissal was filed before Alibaba Cloud had answered or moved for summary judgment — a procedural window that allows a plaintiff to dismiss unilaterally without court approval. Despite the plaintiff-initiated mechanism, PACSEC3 chose to attach a with-prejudice designation, permanently foreclosing re-assertion of the same patent against Alibaba Cloud.
An 83-day lifecycle is notably short even by NPE enforcement standards. The rapid resolution — combined with the with-prejudice election and a mutual cost-bearing arrangement — is consistent with either an out-of-court settlement reached before formal litigation activity matured, or a strategic decision by PACSEC3 to withdraw after evaluating Alibaba Cloud’s early defensive posture. The public record does not disclose whether any financial consideration changed hands, leaving the precise commercial terms unknown.
Filing to Voluntary dismissal in 83 days
83-day case lifecycle — well under the median district court patent case duration
Dismissed with prejudice: what the Rule 41 filing means for both parties
Rule 41(a)(1)(A)(i): plaintiff’s unilateral exit before answer
Federal Rule 41(a)(1)(A)(i) permits a plaintiff to dismiss an action without court order if filed before the defendant has served an answer or a motion for summary judgment. PACSEC3 invoked this right but voluntarily appended a with-prejudice designation — a self-imposed bar that carries the same preclusive effect as a court judgment on the merits.
Voluntary dismissal — with prejudiceWith prejudice bars any future assertion of US7523497B2 against Alibaba Cloud
By electing with-prejudice dismissal, PACSEC3 permanently surrendered the right to re-assert US7523497B2 against Alibaba Cloud US, LLC. This is a meaningful concession: with-prejudice dismissal operates as a final adjudication on the merits under res judicata principles, even though no court evaluated the patent’s validity or infringement on the substance.
Res judicata — same patent, same defendantAlibaba Cloud exits without admitting infringement or conceding validity
Alibaba Cloud achieves a complete exit from litigation without filing an answer, bearing an adverse costs order, or making any public admission of infringement. The with-prejudice dismissal provides strong forward protection against re-assertion of this specific patent by PACSEC3 — though it does not address whether third parties holding related patents could assert similar claims.
No admission — patent still validCost-neutral exit suggests resolution occurred outside the court record
Mutual cost-bearing combined with rapid closure and a with-prejudice election is a pattern commonly associated with confidential settlement. Neither party received a fee award, which also means the case did not trigger an ‘exceptional case’ finding under 35 U.S.C. § 285. The commercial terms, if any, remain entirely undisclosed in the public docket.
Possible confidential settlementFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | PACSEC3, LLC | Company | Patent assertion entity — holder of US7523497B2, network security technologySearch in Eureka ↗ |
| Defendant | Alibaba Cloud US, LLC | Company | Alibaba Cloud US, LLC — cloud computing and e-commerce platform operatorSearch in Eureka ↗ |
| Plaintiff counsel | David John Hoffman | Attorney | Counsel for PACSEC3, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jennifer L. Ishimoto | Attorney | Counsel for PACSEC3, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Jennifer Ishimoto | Law Firm | Representing PACSEC3, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Law Office David J. Hoffman | Law Firm | Representing PACSEC3, LLCSearch in Eureka ↗ |
| Defendant counsel | Bryan G. Harrison | Attorney | Counsel for Alibaba Cloud US, LLCSearch in Eureka ↗ |
| Defendant counsel | Mark A. Hannemann | Attorney | Counsel for Alibaba Cloud US, LLCSearch in Eureka ↗ |
| Defendant counsel | Nicholas Joseph Gallo | Attorney | Counsel for Alibaba Cloud US, LLCSearch in Eureka ↗ |
| Defendant counsel | Ryan A. Lewis | Attorney | Counsel for Alibaba Cloud US, LLCSearch in Eureka ↗ |
| Defendant counsel | Tingkang Xia | Attorney | Counsel for Alibaba Cloud US, LLCSearch in Eureka ↗ |
| Defendant law firm | Troutman Pepper Locke LLP | Law Firm | Representing Alibaba Cloud US, LLCSearch in Eureka ↗ |
| Presiding judge | Judge Jon S. Tigar | Judge | California Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) and expressly designates the dismissal as with prejudice as to the asserted patent, US7523497B2. This language is precise and consequential: the with-prejudice designation — though self-imposed by PACSEC3 rather than ordered by the court — carries full res judicata effect, permanently barring PACSEC3 from re-asserting this patent against Alibaba Cloud. The cost-neutrality clause confirms no fee-shifting was sought or obtained, consistent with a negotiated exit rather than a contested ruling.
US7523497B2 — Network Security Access Control Technology
U.S. Patent No. 7,523,497 (application no. US10/841,064) covers technology in the network security domain — specifically access control mechanisms relevant to cloud-hosted and internet-facing platforms. The patent’s application number places its priority date in the mid-2000s, a foundational period for cloud infrastructure security architecture. Its asserted relevance to AliCloud and Alibaba.com suggests claims directed at platform-level security or authentication workflows.
For cloud platform operators and e-commerce infrastructure providers, US7523497B2 represents a legacy network security patent that PACSEC3 has demonstrated willingness to assert in federal court. The patent’s survival — validity was never adjudicated in this action — means it retains full enforceability against third parties. Competitors operating cloud services or large-scale web platforms with access-control or authentication layers should treat this patent as an active risk asset in PACSEC3’s portfolio.
Should you run an FTO analysis against US7523497B2?
Any organisation operating cloud infrastructure services, SaaS platforms, or large-scale e-commerce environments with network-level access control or authentication components should assess whether US7523497B2 reads on their product architecture. The dismissal in this case resolved nothing on the merits — the patent was never declared invalid or not infringed. PACSEC3 retains full assertion rights against all parties except Alibaba Cloud US, LLC.
PatSnap Eureka’s FTO Search Agent can map the claim scope of US7523497B2 against your product’s technical specification, identify prosecution history estoppel constraints, and surface prior art that could support an IPR petition. For in-house IP teams evaluating cloud security architecture, running a focused FTO before product launch or expansion is measurably lower-cost than defending a pre-answer infringement notice.
Run a freedom-to-operate analysis on US7523497B2 to assess your product’s exposure
Run FTO in Eureka →Similar network security patent cases in the Northern District of California
Explore comparable patent infringement actions involving network security and cloud access control technology litigated in the N.D. Cal. district court.
What this case signals for the cloud platform IP enforcement landscape
A rapid, with-prejudice exit in a California cloud patent case raises questions about assertion strategy and defensive leverage.
Pre-answer dismissals with prejudice often signal off-docket resolution
When a plaintiff voluntarily dismisses with prejudice before the defendant has even answered, and both parties absorb their own costs, the pattern is consistent with a confidential resolution. IP teams monitoring PACSEC3’s assertion activity should note that no public terms were recorded in this docket.
US7523497B2 remains enforceable against parties other than Alibaba Cloud
The with-prejudice dismissal is defendant-specific. PACSEC3 retains the right to assert US7523497B2 against other cloud infrastructure or e-commerce platform operators. Companies offering services technically comparable to AliCloud should assess their exposure independently.
PACSEC3 v Alibaba — key questions answered
The with-prejudice designation permanently bars PACSEC3, LLC from re-asserting US7523497B2 against Alibaba Cloud US, LLC in any future action. It carries the same preclusive effect as a judgment on the merits under res judicata doctrine, even though no court ruled on infringement or validity. PACSEC3 retains full rights to assert the patent against other defendants.
Federal Rule of Civil Procedure 41(a)(1)(A)(i) permits a plaintiff to file a notice of voluntary dismissal without court order at any time before the defendant serves an answer or a motion for summary judgment. Alibaba Cloud had not yet answered, so PACSEC3 could dismiss unilaterally. The plaintiff chose to add a with-prejudice designation, which is permissible and self-binding.
No. The voluntary dismissal was procedural and occurred before any substantive merits briefing. US7523497B2 was never examined for validity or infringement by the court, so the patent remains presumptively valid and fully enforceable against all parties other than Alibaba Cloud US, LLC under the terms of the specific dismissal notice.
When both parties agree to bear their own costs in a patent case that closes this quickly, it typically suggests either a negotiated resolution outside the court record or a decision by the plaintiff to withdraw after assessing early defensive signals. No fee-shifting means the case did not qualify — or was not argued — as exceptional under 35 U.S.C. § 285. The actual commercial terms, if any, are not publicly disclosed.
The case was filed in the U.S. District Court for the Northern District of California, case number 4:25-cv-06807, and was assigned to District Judge Jon S. Tigar. The case closed on November 3, 2025, after 83 days, before any substantive rulings were issued.
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