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No. 10323940
United States Court of Appeals for the Ninth Circuit
Teradyne, Inc. v. Astronics Test Systems, Inc.
No. 10323940 · Decided January 30, 2025
No. 10323940·Ninth Circuit · 2025·
FlawFinder last updated this page Apr. 2, 2026
Case Details
Court
United States Court of Appeals for the Ninth Circuit
Decided
January 30, 2025
Citation
No. 10323940
Disposition
See opinion text.
Full Opinion
NOT FOR PUBLICATION FILED
UNITED STATES COURT OF APPEALS JAN 30 2025
MOLLY C. DWYER, CLERK
U.S. COURT OF APPEALS
FOR THE NINTH CIRCUIT
TERADYNE, INC., No. 24-239
D.C. No.
Plaintiff - Appellant, 2:20-cv-02713-GW-SHK
v.
MEMORANDUM*
ASTRONICS TEST SYSTEMS, INC.,
Defendant - Appellee.
Appeal from the United States District Court
for the Central District of California
George H. Wu, District Judge, Presiding
Argued and Submitted January 16, 2025
San Francisco, California
Before: H.A. THOMAS and MENDOZA, Circuit Judges, and BOLTON, District
Judge.**
Teradyne, Inc. appeals the district court’s grant of summary judgment to
Astronics Test Systems, Inc. after the district court found that Astronics’ copying
of Teradyne’s copyrighted software code (“Asserted Works”) constituted fair use.
*
This disposition is not appropriate for publication and is not precedent
except as provided by Ninth Circuit Rule 36-3.
**
The Honorable Susan R. Bolton, United States District Judge for the
District of Arizona, sitting by designation.
We have jurisdiction under 28 U.S.C. § 1291. We review de novo a district court’s
grant of summary judgment. Bayer v. Neiman Marcus Grp., Inc., 861 F.3d 853,
861 (9th Cir. 2017). We review whether an alleged act of copying constitutes fair
use as a “mixed question of law and fact.” Google LLC v. Oracle Am., Inc., 593
U.S. 1, 24 (2021) (citing Harper & Row Publishers, Inc. v. Nation Enters., 471
U.S. 539, 560 (1985)). Although “fair use” is a mixed question of law and fact, the
“question primarily involves legal work.” Id. (citation omitted). We affirm.
The district court properly applied the Supreme Court’s decision in Google,
which controls the outcome of this case. In Google, the Supreme Court held that
limited copying of “functional” code for a “transformative” purpose cuts in favor
of fair use on all the applicable statutory factors. Id. at 30–32. As in that decision,
the four statutory factors that govern the fair use analysis individually and
collectively favor fair use here. See id. at 19–20, 40. Those factors are (1) “the
purpose and character of the use, including whether such use is of a commercial
nature”; (2) “the nature of the copyrighted work”; (3) “the amount and
substantiality of the portion used in relation to the copyrighted work as a whole”;
and (4) “the effect of the use upon the potential market for or value of the
copyrighted work.” 17 U.S.C. § 107(1)–(4).
Factors one and two both favor Astronics. First, Astronics’ use of
Teradyne’s code was transformative in that it enabled customers to continue using
2 24-239
their own test program sets (“TPSs”) on Astronics’ compatibility software and
accompanying digital test instruments. See Sony Comput. Ent. v. Connectix Corp.,
203 F.3d 596, 606 (9th Cir. 2000) (finding Connectix’s use of Sony’s software to
be “modestly transformative” because it allowed customers to play games made for
Sony’s console on personal computers). Second, as the district court noted,
Teradyne’s Asserted Works are “functional” in nature and furthest from the “core”
of copyright protection. See Google, 593 U.S. at 29 (underscoring that “declaring
code is, if copyrightable at all, further than are most computer programs . . . from
the core of copyright”).
The remaining two factors also weigh in favor of fair use. Whether
considered as sixteen copyrighted works or as a collective, the district court did not
err in finding that the amount of the code copied in relation to the entire
Application Programming Interface (“API”) is comparable to that in Google. See
id. at 33 (finding as fair use the copying of 11,500 lines of code, approximately
.4% of the entire API at issue). And the “effect of the use upon the potential market
for or value of the copyrighted work” additionally supports fair use. 17 U.S.C.
§ 107(4). A contrary holding would promote the type of monopolistic lock-in that
fair use law protects against by requiring customers to rely solely upon Teradyne’s
work to run their TPSs, or that they rewrite or recreate their TPSs altogether. See
Google, 593 U.S. at 39 (“An attempt to monopolize the market by making it
3 24-239
impossible for others to compete runs counter to the statutory purpose of
promoting creative expression.” (quoting Sega Enters. v. Accolade, Inc., 977 F.2d
1510, 1523–24 (9th Cir. 1992))).
AFFIRMED.
4 24-239
Plain English Summary
NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS JAN 30 2025 MOLLY C.
Key Points
01NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS JAN 30 2025 MOLLY C.
02MEMORANDUM* ASTRONICS TEST SYSTEMS, INC., Defendant - Appellee.
03Wu, District Judge, Presiding Argued and Submitted January 16, 2025 San Francisco, California Before: H.A.
04THOMAS and MENDOZA, Circuit Judges, and BOLTON, District Judge.** Teradyne, Inc.
Frequently Asked Questions
NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS JAN 30 2025 MOLLY C.
FlawCheck shows no negative treatment for Teradyne, Inc. v. Astronics Test Systems, Inc. in the current circuit citation data.
This case was decided on January 30, 2025.
Use the citation No. 10323940 and verify it against the official reporter before filing.