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A comment on The patent on SIFT expired yesterday. Parent comment

Re:The patent on SIFT expired yesterday by rsp1984 on Monday March 09, 2020 @06:27AM (#22524278)
I'm not a lawyer, but as far as I know expired US patents enter the public domain. After their expiration the described invention can be freely used by anyone for any purpose [1].

So I think the answers to your questions are yes and no.

[1] https://www.nolo.com/legal-encyclopedia/how-long-is-my-paten...

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Re:The patent on SIFT expired yesterday by amelius on Monday March 09, 2020 @08:39AM (#22524872)
Perhaps there are still patents in other regions (?)
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Re:The patent on SIFT expired yesterday by dr_zoidberg on Tuesday March 10, 2020 @09:52AM (#22535431)
As others commented, the only countries where software patents work are the US and Japan. So it'd be just Japan that could have a patent in place? Don't know theh details, and IANAL.

OTOH, I'd really like the patent to be inactive, it'd allow me to work worry free in a lot of things that I've had an interest in.

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