When exporting to PDF, certain TTF fonts are embedded (with subsetting),
others are mapped to (old) Acrobat Reader builtin fonts.

I am trying (for interoperability reasons)
to use the TrueType versions of URW Nimbus Sans
fonts in OOo 2.2 Writer.
(URW Nimbus Sans is an Helvetica look-alike.)
(included in
<http://www.artfiles.org/ghostscript/AFPL/GhostPCL/urwfonts-1.41.tar.gz>.)
Installed these 4 TTF fonts via spadmin without problem.

I have written an OOo 2 Writer document
referencing these Nimbus Sans TrueType fonts.
It displays and prints as expected; exporting to PDF is correct;
the fonts are embedded in the PDF document.

However, when I modify the font family TTF files
to have their fontnames defined as Helvetica, Helvetica-Bold,
Helvetica-BoldOblique and Helvetica-Oblique (to match Acrobat Reader v4
builtin font names) the following happens:

- display and printing work well; the 4 TrueType
fonts are suitably embedded (and presumably subset)
in the printer PostScript code;

- when exporting to PDF, the two Bold fonts
are not embedded, instead the PDF documents
refers to the corresponding PDF interpreter builtin fonts.
In contrast the two non-Bold fonts are embedded (and suitably subset).

This is IMO unacceptable for the following reasons:
- the behaviour is not consistent between the
Bold and non-Bold variants;

- now that Adobe ships
its PDF Reader (v7) with Myriad and Minion in lieu
of Helvetica and Times or TimesNewRoman,
it has become a poor choice to avoid embedding
for any of the former PDF Base14 fonts
(4 Courier variants, 4 Helvetica variants,
 4 Times variants, Symbol, Zapf Dingbats).

(I believe that not embedding the fonts should be left
 as an option to the user, with embedding as default behaviour.)