standard-essential
C2CEFR level
80/100Rarity: very rare
TechnicalRegister
Describing a patent that must necessarily be used to comply with an industry standard.
Because the patent was standard-essential, the owner was obliged to license it on fair and reasonable terms.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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