My Font "Tudor Rose" Seems to have difficulty when embedded by dopdf.
The font is available from http://openfontlibrary.org/font/tudor-rose
When the font is embedded the encoding is garbled (Lorem ipsum becomes Upsfn, lqtvn,) Thus it seems to be one out (except when it isn't)
If the font isn't embedded the correct letters can be seen, so it seems to be a problem with the embedding. Correct pdfs (the preview correctly with Reader) can be produced with pdfcreator, and the font appears to have a correct encoding vector.