https://bugzilla.redhat.com/show_bug.cgi?id=1908922
Linus Lewandowski <li...@lew21.net> changed:
What |Removed |Added
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CC| |li...@lew21.net
--- Comment #17 from Linus Lewandowski <li...@lew21.net> ---
aptX was created by Audio Processing Technology Ltd (a subsidiary of Solid
State Logic Ltd) in 1990s - see https://www.aptx.com/history and
https://patents.google.com/patent/EP0398973B1/en (the expired patent mentioned
earlier)
APT Ltd was sold - (one can safely assume: together with all the patents
required for aptX) - in 2005:
https://www.mixonline.com/technology/solid-state-logic-sells-apt-381257
There is only one patent assigned to APT Ltd:
https://patents.google.com/?assignee=Audio+Processing+Technology+Limited - it's
the expired one (EP0398973B1).
The original owner - Solid State Logic Ltd - had some more patents:
https://patents.google.com/?assignee=Solid+State+Logic - but they're all
expired, except for one from 2020.
So... I'm pretty sure that there is no other patent that affects aptX itself.
There might still be something affecting aptX LL (launched in 2012) and aptX HD
(launched in 2016) - but they aren't really innovative.
aptX LL is the trivial merge of the idea behind CSR FastStream (launched in
2008, https://web.archive.org/web/20080509054609/www.csr.com/pr/pr328.htm) and
the aptX codec. FastStream looks like patent-free, because it's referred to in
https://patents.google.com/patent/US9398620B1/en (expired), and this patent
does not depend on any other related patent - while it describes how to use
FastStream in a selected use case.
aptX HD seems to just be a different set of settings for the aptX algorithm,
but I'm not really sure here, I haven't looked at the code.
On the other hand, aptX Adaptive (launched in 2018) might be innovative - it
introduces variable bit rate - so I wouldn't recommend adding it at this point.
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