If you want to submit your document to a conference or workshop, you might need to make sure, that all fonts are embedded. The check for this is much easier than ﬁxing the issue by invoking the following command which lists all used fonts:
If all fonts have a
yes in the
emb column, everything is ﬁne. Otherwise, you might need to check your graph plotting tools like Matlab, R or gnuplot. Matlab should be used with EPS export and then convert the eps ﬁle to PDF “by hand” (
pstopdf). R and gnuplot do have tikz devices which you deﬁnitely should consider to use for your plots. They are not only ﬁxing the issue of the embedded fonts, but also make the graphs look much nicer as they are plotted as native LaTeX ﬁgures.