Zstd is already used in the Linux kernel, and I would assume that any patents covering Lempel-Ziv and Huffman coding would have expired long ago. The situation

Zstd is already used in the Linux kernel, and I would assume that any patents covering Lempel-Ziv and Huffman coding would have expired long ago. The situation around ANS also seems to have been resolved, see https://en.wikipedia.org/wiki/Asymmetric_numeral_systems#Tabled_variant_(tANS) https://en.wikipedia.org/wiki/Asymmetric_numeral_systems#Tab... .