ecm - Encoder/decoder for Error Code Modeler format
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ECM is a compression format for CD images which removes ECC/EDC data where it's
possible to do so losslessly. Compressing a CD image with ECM first, then
compressing the ECM file with a general-purpose compressor such as 7z or RAR,
can result in better compression than 7z or RAR alone.

See http://www.neillcorlett.com/ecm/ for more details.

Usage:

To encode:
    ecm cdimagefile
    ecm cdimagefile ecmfile
    ecm e cdimagefile ecmfile

To decode:
    unecm ecmfile
    unecm ecmfile cdimagefile
    ecm d ecmfile cdimagefile