This package includes a collection of free PostScript Printer Description files for PostScript (and clone) printers from various manufacturers, as distributed by OpenPrinting. . If you have non-PostScript printers, the foomatic-filters-ppds and hplip-ppds packages are the ones you need; this package won't be of much help to you. . Some manufacturers distribute PPD files for their printers under non-free licenses; those are not included in this package, but may be available from the manufacturer's website or included on a CD or other media with the printer.
