How to embeded all fonts into pdf to produce a IEEE allowed camera ready version

Usually the font produced by Matlab "Helvetica" is not embeded which
will lead to the problem --- the IEEE publisher will require you to
embed all the fonts into pdf.

How to check that?

File -> properties -> Fonts
You will see each font and if there is a "(Embeded subsets)" in the
end of the fonts, that means it is embeded, else it is not. Usually if
you use pdflatex, the figures you preduced from Matlab will have
Helvetica Font, but it is usually not embeded.

The way to get rid of this:
1) Similar to http://lvb.wiwi.hu-berlin.de/doc/embedfonts.pdf
We just use the Adobe PDF pro or Acrobat 7.0 professional etc.
What I did is in the SCF machine(Mac OS), which installed the Adobe
PDF Pro, then save to Adobe PDF..., and then choose to convert, and
launch Adobe PDF pro afterwards. I guess the last step is not
neccessary.

2) https://sites.google.com/site/xyzliwen/resource/embed_font_ieee_pdf_explore,
But I haven't use this trick, which I didn't have gswin32. And this is
a very tedious method, though better than other methods.