RC6.

RC6

RC6

UEI protocol: 0058
IRP notation: {36k,444,msb}<-1,1|1,-1>(6,-2,1:1,0:3,<-2,2|2,-2>(T:1),D:8,F:8,^107m)+
EFC translation: MSB

RC6 is the name used for the first member of the RC6 family of protocols. Technically this is RC6-0-16, but DecodeIr will always display that as simply "RC6"

RC6-6-20

IRP notation: {36k,444,msb}<-1,1|1,-1>(6,-2,1:1,6:3,<-2,2|2,-2>(T:1),D:8,S:4,F:8,-???)+
EFC translation: MSB

This protocol is commonly used in Sky and Sky+ remotes. As of version 8.31, KM does not have built-in support for this protocol, but there are KM format upgrade files available for Sky and Sky+ (built by an expert who isn't limited to KM's built-in protocols). RM has built-in support for RC6-M-20n protocol, which can be used to make Sky and Sky+ upgrades (or any other RC6-6-20 upgrades as long as the T bit is the same for all learned signals, as it is with Sky). To use RC6-M-20n for RC6-6-20, you must leave the M field in RM's setup sheet with its default value of 6, and you must set or leave the T field (if present) to the value shown in all the decodes (which I assume will be 0).

RC6-?-??

IRP notation: {36k,444,msb}<-1,1|1,-1>(6,-2,1:1,M:3,<-2,2|2,-2>(T:1),???:??)+

This is the generic form for a decode of protocols in the RC6 family. DecodeIr uses this form for all RC6 decodes, except RC6-0-16 which is displayed as simply "RC6", RC6-6-24 which is displayed as "Replay" and some RC6-6-32 which display as MCE.

The first ? in the protocol name is the M value in the RC6 spec. The ending ?? represents the number of data bits in the signal.