It seems they're pretty directly admitting to referring to the LGPL library while implementing theirs under a different license.
I wonder if they'll have no issues with people directly reading their code while happening to implement the same functionality with a closed license? Or a GPL-style one?
I'm surprised they admitted to it - it's hardly "Clean Room"....
> I'm surprised they admitted to it - it's hardly "Clean Room"....
"Clean Room" RE isn't always legally required.
Seems to me the most expectations they had with the library was about the compression stuff and it did not include that. So in the end it was mostly rev eng. Also in this specific case you are using the library code as documentation about the hardware, the code itself has little value. I doubt it would configure as license violation.