BillSure LLC v. Flexera Software LLC: Infringement Action Dismissed With Prejudice in 85 Days
BillSure LLC asserted US8005457B2 — covering methods and systems for verifying network resource usage records — against Flexera Software LLC in the Northern District of Illinois. The case ended in a voluntary dismissal with prejudice under FRCP 41(a)(1)(A)(i) just 85 days after filing, before Flexera had answered the complaint.
Pre-answer dismissal with prejudice signals swift resolution in network IP dispute
BillSure LLC, the holder of US8005457B2, filed a patent infringement action against Flexera Software LLC on 6 August 2025 in the U.S. District Court for the Northern District of Illinois before Judge April M. Perry. The asserted patent covers a method and system for verifying network resource usage records — a technology domain directly relevant to software asset management and software licensing platforms of the kind operated by Flexera.
The case was terminated on 30 October 2025 — just 85 days after filing — when BillSure filed a notice of voluntary dismissal with prejudice under FRCP 41(a)(1)(A)(i). Critically, Flexera had not yet served an answer to the complaint at the time of dismissal. With prejudice dismissal extinguishes BillSure’s right to refile the same claims against Flexera, and the parties agreed each would bear its own costs, fees, and expenses.
The 85-day timeline is notably short and suggests the dispute was resolved — or abandoned — before any substantive litigation activity could develop. The pre-answer posture and the absence of a cost award are consistent with a private settlement or a commercial decision by BillSure not to proceed, though the public record does not disclose the underlying reason. What remains unknown is whether any licensing arrangement was reached or whether BillSure assessed the claim as commercially unviable after filing.
Filing to Voluntary dismissal in 85 days
85 days — resolved well below the typical 2–3 year district court patent litigation lifecycle
Dismissed with prejudice: what the voluntary exit means for both parties
FRCP 41(a)(1)(A)(i) — unilateral dismissal before answer
Under Rule 41(a)(1)(A)(i), a plaintiff may dismiss an action without a court order by filing a notice before the defendant has served an answer or a motion for summary judgment. BillSure exercised this right but elected dismissal with prejudice — a voluntary addition that carries permanent legal consequence beyond the rule’s default, which would otherwise allow refiling.
Plaintiff-initiated, pre-answer exitWith prejudice: BillSure permanently bars its own claims against Flexera
A dismissal with prejudice operates as a final adjudication on the merits for res judicata purposes. BillSure cannot refile the same infringement claims under US8005457B2 against Flexera in any federal court. This is an unusually strong concession by the plaintiff and suggests either a settlement that made continuation unnecessary or a strategic decision to permanently exit this particular dispute.
No refiling possible against FlexeraFlexera exits without answering — and without paying costs
Flexera Software achieved a complete exit from this litigation without filing an answer, incurring no court-imposed fee liability, and obtaining permanent protection from BillSure re-asserting US8005457B2 in this dispute. The absence of a prevailing-party cost award means Flexera could not pursue attorneys’ fees under 35 U.S.C. § 285, but the with-prejudice bar provides equivalent commercial certainty.
Full protection, no cost awardUS8005457B2 remains enforceable — but not against Flexera
The dismissal does not invalidate or limit US8005457B2. BillSure retains the patent and may assert it against other parties in the software asset management and network usage verification space. Competitors to Flexera operating in similar technology categories should treat this outcome as neutral on patent validity — the claim was never tested on the merits in this proceeding.
Patent survives; other targets remain at riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | BillSure LLC | Company | Patent assertion entity — holder of US8005457B2, a network usage verification method patentSearch in Eureka ↗ |
| Defendant | Flexera Software LLC | Company | Flexera Software LLC — software asset management and IT visibility solutions providerSearch in Eureka ↗ |
| Plaintiff counsel | Isaac Philip Rabicoff | Attorney | Counsel for BillSure LLCSearch in Eureka ↗ |
| Plaintiff law firm | Rabicoff Law LLC | Law Firm | Representing BillSure LLCSearch in Eureka ↗ |
| Defendant counsel | Andrew Shea Mcelligott | Attorney | Counsel for Flexera Software LLCSearch in Eureka ↗ |
| Defendant counsel | Hugham Chan | Attorney | Counsel for Flexera Software LLCSearch in Eureka ↗ |
| Defendant counsel | Jon W. Gurka | Attorney | Counsel for Flexera Software LLCSearch in Eureka ↗ |
| Defendant law firm | Crowell & Moring LLP | Law Firm | Representing Flexera Software LLCSearch in Eureka ↗ |
| Defendant law firm | Knobbe, Martens, Olson & Bear LLP | Law Firm | Representing Flexera Software LLCSearch in Eureka ↗ |
| Presiding judge | Judge April M. Perry | Judge | Illinois Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes FRCP 41(a)(1)(A)(i) and specifies ‘with prejudice’ — language that goes beyond the rule’s default. Because Flexera had not answered, BillSure could have dismissed without prejudice and preserved future optionality. The deliberate election of with-prejudice terms, combined with the mutual cost-bearing provision, is consistent with a negotiated exit rather than a unilateral abandonment, though no settlement terms are disclosed in the public record.
US8005457B2 — Method and System for Verifying Network Resource Usage Records
US8005457B2 (application number US11/219030) covers a method and system for verifying network resource usage records — a technical domain encompassing the accurate metering, validation, and audit of usage data generated by networked systems. This area of IP sits at the intersection of billing integrity, software licensing compliance, and cloud usage metering. The patent would be relevant to platforms that track, validate, or reconcile consumption data across distributed software or network infrastructure environments.
Flexera Software operates directly in the software asset management and IT visibility space, making it a commercially logical enforcement target for a patent in network usage record verification. The patent’s claim scope — if broadly construed — could potentially read on usage tracking, licence reconciliation, or cloud cost management features common across enterprise software platforms. Companies in adjacent categories including IT asset management, SaaS metering, and cloud FinOps should assess whether their own systems fall within the patent’s technical reach, particularly given that this case ended without any validity or infringement determination.
Should your product team run an FTO against US8005457B2?
Any software vendor or cloud platform provider whose products involve verifying, auditing, or reconciling network resource usage data should treat US8005457B2 as a live enforcement risk. The patent was never invalidated in this proceeding. BillSure retains full rights to assert it against new defendants. Teams building IT asset management tools, cloud cost metering features, software licence compliance modules, or network billing verification systems are in the highest-exposure categories.
PatSnap Eureka’s FTO Search Agent can map the claim language of US8005457B2 against your product architecture, identify prior art that might support an IPR petition, and flag any continuation or continuation-in-part applications that may extend the patent family’s reach. Running a structured FTO now — before a demand letter arrives — puts your legal and engineering teams in a stronger negotiating and defensive position.
Run a freedom-to-operate analysis on US8005457B2 to assess your product’s exposure
Run FTO in Eureka →Similar Patent Cases: Network Usage Verification Software IP Disputes
Cases involving software usage verification and IT asset management patents in U.S. district courts, with comparable pre-answer dismissal or early-exit outcomes.
What this case signals for the software asset management IP landscape
A rapid pre-answer exit with prejudice in a software usage-verification dispute carries distinct strategic signals for IP teams and product counsel.
Pre-answer with-prejudice dismissals often mask private resolution
When a plaintiff voluntarily dismisses with prejudice before the defendant has even answered, the most commercially rational explanation is a private licensing arrangement or payment. IP teams at software companies facing similar assertion patterns should treat early pre-answer exits as a signal to monitor for subsequent licensing activity targeting the same patent.
US8005457B2 remains live — network verification IP is still in play
This dismissal carries no validity finding. US8005457B2 survives intact and BillSure is free to assert it against other defendants. Software vendors operating in IT asset management, cloud cost metering, or network usage billing should assess their exposure to this patent’s claims before enforcement resumes elsewhere.
BillSure v Flexera — key questions answered
Dismissal with prejudice under FRCP 41(a)(1)(A)(i) means BillSure permanently relinquished its right to bring the same patent infringement claims under US8005457B2 against Flexera Software. The dismissal functions as a final adjudication on the merits for res judicata purposes, preventing any refiling of these specific claims against Flexera in any federal court.
BillSure asserted US8005457B2, a patent covering a method and system for verifying network resource usage records. The application number is US11/219030. The patent addresses technical processes for validating and reconciling usage data generated by networked systems — a domain relevant to software asset management, licence compliance, and cloud metering platforms.
The 85-day resolution, ending before Flexera had even filed an answer, is consistent with either a private licensing arrangement or BillSure’s decision not to pursue the claim after initial assessment. The voluntary with-prejudice election — rather than a default without-prejudice dismissal — suggests the exit was negotiated rather than unilateral, though the public record does not confirm any settlement terms.
No. A voluntary dismissal carries no validity finding. US8005457B2 remains issued and enforceable against third parties. BillSure retains the right to assert the patent against any defendant other than Flexera Software. Companies in software asset management, IT usage metering, or network billing verification should not treat this outcome as clearing the patent from the enforcement landscape.
The dismissal notice specifies that each party shall bear its own costs, expenses, and attorneys’ fees. No prevailing-party cost award was made. Because the case was dismissed before a final judgment on the merits, Flexera could not pursue an attorneys’ fee award under 35 U.S.C. § 285, which requires a finding of an exceptional case — unavailable in a pre-answer voluntary dismissal.
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