I created a PDF file using a non-CID CFF OpenType font (namely 
GFSDidot.otf) with font subsetting enabled. The PDF is created without 
errors and it is displayed correctly when using Adobe Reader 7.x. But 
when using Adobe Reader 8.1 text based on the OpenType subset font is 
not displayed anymore, although Adobe Reader does not show an error 
message. Interestingly the characters seem to be there somehow since it 
is possible to mark the blank area where the text should be displayed 
and to copy the text to an editor. But the text is not rendered neither 
on screen nor when printed.

If subsetting is turned off for the OpenType font and the complete font 
is embedded, then Adobe Reader 8.1 renders the text correctly on screen.

Has someone an idea what's causing this behaviour? What has to be done 
that OpenType font subsets are handled correctly by Adobe Reader 8.1? Is 
information missing in the generated CFF font subset? Or is additional 
information needed in any PDF dictionary?

Regards,

Ulrich


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