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翠星石 (suiseiseki@freesoftwareextremist.com)'s status on Sunday, 01-Dec-2024 23:21:43 JST翠星石 @taylan @lucy @azureazure It is possible for patents to be royalty-free but still proprietary.
All original mp3 patents have expired (and free mp3 encoders/decoders exist), but many, many invalid patents on audio encoding mathematical schemes that arguably apply to mp3 have since been granted.