Last year there was information about rANS patent ( http://cbloomrants.blogspot.com/2015...e-fucking.html ), it is now published:

https://www.ipo.gov.uk/p-ipsum/Case/...er/GB1502286.6

https://www.ipo.gov.uk/p-ipsum/Docum...20document.pdf

Here is a timeline for UK Patent application: http://www.withersrogers.com/wp-cont..._time_line.pdf

It seems extremely general:

Title: "System and method for compressing data using asymmetric numeral systems with probability distributions"

Abstract: "A data compression method using the range variant of Asymmetric Numeral Systems, rANS, to encode a data stream, where the probability distribution table(s) used is constructed using a Markov model. A plurality of probability distribution tables may be used each constructed from a subset of the data stream and each used to encode another subset of the data stream. The probability distribution table may compromise a special code (or 'escape code') which marks a temporary switch to second probability distribution table. The probability distribution table itself may be stored in a compressed format. The data stream may be information containing gene sequences or related information."

How to fight it?

update: there is also US patent application - http://www.freepatentsonline.com/y2016/0248440.html

update1:editable Google doc to reply to the patent- please add a short description about your earlier than 11.02.2015 connected compressor (or some you know, or e.g. paper) - emphasizing similarities:

https://docs.google.com/document/d/1-86_o0fzTHs6TyU4TaF-ufOZ4Xr3zEskyLYI6Nehavw/edit

update2: non-final rejection for the US application with comments from USPTO expert:

https://register.epo.org/ipfwretrieve?apn=US.201615041228.A&lng=en

https://dl.dropboxusercontent.com/u/...1479580692.pdf