> It seems that this package has something to do with your CJK.
Not really. It is a generic program, normally to be used in
conjunction with its sister program, ttf2pk, to convert TTFs to TFM
metrics and PK font files.
> 2- And furthermore, can I use CJK package without this package
installed?
Yes. The SFD (subfont definition) files, however, are used by other
programs also, e.g., dvipdfmx or fontforge (the latter is not part of
TeXLive).
Werner
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