ALERT! S...ing MS!!! 
Microsoft last month received a US patent covering modifications to a data-encoding technique called rANS, one of several variants in the Asymmetric Numeral System (ANS) family that support data compression schemes used by leading technology companies and open source projects....
https://www.theregister.com/2022/02/...ft_ans_patent/
https://patents.google.com/patent/US11234023B2/en