Try searching for Embedded Fonts in the Flash Help. Basically you can save
fonts to the library, and use those from any computer ( i think...)
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I don't think that is the case.

If you open an FLA that uses a font not present on your PC, then you are
asked to do a font substitution for the font that is not present to one that
is present. I'm pretty sure that it doesn't matter if that font is in the
library or not. In this case, the library is a reference to the font on the
system . .the font itself is not fully embedded in the FLA (if it was, there
would be all sorts of legal ramifications re copyright etc).

For SWF files the situation is different .. the SWF contains either a device
font (reference to a font already on the viewers computer), or it has vector
shapes for the characters of the font that are included .. but not the font
itself (i.e. no font hints etc etc). Effectively it is simply the image of
the letters (just like taking a bitmap image of text made with the font ..
its not the same as having the font itself).