[NTG-context] Remove external file name references

Hi, When external PDF graphics are included in a document (e.g., using externalfigure), the resulting PDF contains a line such as: /PTEX.FileName (/home/username/path/to/file.pdf) What ConTeXt command prevents external file names from being written to the PDF? I've tried: \pdfptexfilename=0 \ptexinfo=0 \pdfsuppressptexinfo Links to a thread discussing the issue for pdftex: http://tug.org/mailman/htdig/pdftex/2007-August/007290.html http://tug.org/mailman/htdig/pdftex/2007-August/007294.html Thank you.