[XeTeX] embedding fonts

[hh-brasil at bol.com.br]

Is there a way to ensure that adobe distiller or acrobat pro embed the full fonts in the pdf-document produced with xelatex. Or can you name any program which can do that.
The printing houses insist on full fonts because that way they can (sometimes) correct errors (generally with the - expensive - pitstop program). 
But when I checked the pdf files gained with xelatex, only subsets were saved, which is not enough. 

hh