CardAuth Solutions LLC v. Yubico Inc. - Patent Complaint
Summary
CardAuth Solutions LLC filed a patent infringement complaint against Yubico Inc. on April 25, 2026 in the Northern District of California (Case 3:26-cv-03576). The complaint alleges Yubico's hardware security key products infringe CardAuth's patent rights. Attorney Bradford Black filed the complaint on behalf of CardAuth Solutions LLC with a filing fee of $405. Additional filings include a certificate of interested entities, a report on the action, proposed summons, and a notice of pendency of other action involving the same patent.
“COMPLAINT against Yubico, Inc. ( Filing fee $ 405, receipt number ACANDC-21911755.). Filed by CardAuth Solutions LLC.”
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What changed
CardAuth Solutions LLC initiated a patent infringement lawsuit against Yubico Inc. in the Northern District of California on April 25, 2026. The complaint specifically targets Yubico's hardware security key products as infringing CardAuth's patent. Concurrent filings indicate CardAuth has pending actions involving the same patent in other proceedings, suggesting a pattern of patent enforcement litigation.
For Yubico Inc., this complaint initiates formal litigation requiring response through either an answer, motion to dismiss, or other procedural response within court deadlines. Companies in the hardware security or authentication device sector should monitor this case for potential implications regarding patent exposure and defensive strategies in the authentication technology space.
Archived snapshot
Apr 26, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
CardAuth Solutions LLC v. Yubico, Inc.
Case Number: 3:26-cv-03576 Location: San Francisco Case Type: Civil Case Basis: Federal Question Nature of Suit: Patent Date Filed:
April 25, 2026
Last Filing Date:
April 25, 2026
View Publicly Available Documents Case Summary No summary of this case is available
Recent Filings
| Date Filed | Docket Number | Document Description |
|---|---|---|
| 04-25-26 | 1 | COMPLAINT against Yubico, Inc. ( Filing fee $ 405, receipt number ACANDC-21911755.). Filed by CardAuth Solutions LLC. (Attachments: # (1) Exhibit A)(Black, Bradford) |
| 04-25-26 | 2 | Certificate of Interested Entities by CardAuth Solutions LLC identifying Other Affiliate G. Wouter Habraken for CardAuth Solutions LLC. (Black, Bradford) |
| 04-25-26 | 3 | REPORT on the filing or determination of an action regarding (cc: form mailed to register). (Black, Bradford) |
| 04-25-26 | 4 | Proposed Summons. (Black, Bradford) |
| 04-25-26 | 5 | NOTICE of Pendency of Other Action Involving Same Patent by CardAuth Solutions LLC (Black, Bradford) |
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