--resourcedir=PATH
Specifies an alternate resource directory which contains the CIDFont resources in its CMap and CIDFont subdirectories. By default, these resources are stored in c:/Program Files/Lizardtech/PDFtoDjVu/resources. Users are encouraged to add additional CIDFont resources here and not specify an alternate directory.
Example
pdftodjvu
--resourcedir=C:/GSResources document.pdf document.djvu
See also Configuring Asian Font Support.