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翠星石 (suiseiseki@freesoftwareextremist.com)'s status on Monday, 28-Oct-2024 22:56:22 JST翠星石 @hazlin Metric has been free from the start, free of proprietary restrictions and that includes even the more modern SI units.
The US customary units used to be completely proprietary, but they're less proprietary now, as all the units are defined based off SI units - although the wasteful extra steps required to do basic calculations are proprietary.