There is no verified evidence that an official iPhone 17 trailer was caught leaking before the event due to copyright issues; rather, leaks and purported videos have surfaced, but no direct link to copyright enforcement causing a trailer leak has been confirmed.
iphone 17 trailer caught before event due to copyright

How Do Case Makers Reveal iPhone 17 Designs Before Apple? - MacRumors
Source: macrumors.com
Key Evidence
Multiple sources report leaked videos and images of iPhone 17 models from production lines or unofficial sources.
dailymail.co.ukdailymail.co.ukiPhone 17 LEAKS online just one week before the Apple event - and it confirms a...
gsmarena.comgsmarena.comiPhone 17 Pro Max leaks in purported hands-on video from the production line+1 more
CNET reports an AI copyright lawsuit against Apple unrelated to any trailer leak.
cnet.comcnet.comApple Gets Hit With AI Copyright Lawsuit Days Before iPhone 17 Event
No source confirms an official iPhone 17 trailer was caught leaking due to copyright takedown or enforcement.
What the Evidence Shows
The claim that an iPhone 17 trailer was caught leaking before the event due to copyright reasons is not supported by the available evidence from the provided sources. Multiple sources report leaks of iPhone 17 models, including videos purportedly from production lines, and leaked specifications.appleinsider.comappleinsider.comiPhone 17 specifications leaked ahead of event There are also unofficial videos and renders circulating on platforms like YouTube.
gsmarena.comgsmarena.comiPhone 17 Pro Max leaks in purported hands-on video from the production line+4 more
However, none of these sources explicitly confirm that an official Apple trailer for the iPhone 17 was leaked prematurely because of copyright enforcement or takedown actions. The only mention of copyright-related issues is an unrelated AI copyright lawsuit against Apple reported by CNET days before the event, which does not connect to any trailer leak.cnet.comcnet.comApple Gets Hit With AI Copyright Lawsuit Days Before iPhone 17 Event
The presence of leaked videos and images is common in the lead-up to Apple events, often originating from production line footage or third-party case makers revealing designs.macrumors.commacrumors.comHow Do Case Makers Reveal iPhone 17 Designs Before Apple? These leaks are typically unofficial and unauthorized but do not necessarily involve copyright takedown incidents causing a trailer leak.
In summary:
Leaked videos and images of iPhone 17 models exist but are unverified in authenticity.
No credible source confirms a trailer leak caused by copyright enforcement.
The AI copyright lawsuit mentioned is unrelated to any iPhone 17 trailer leak.
Therefore, the claim conflates separate issues and lacks direct evidence linking a trailer leak specifically to copyright enforcement actions.