request: provide signed ppd files?
As an aside to bug #5267: the signed printer driver was downloaded from http://openprinting.org/driver/Postscript-Ricoh/, where it was only available in .rpm and .deb formats. Manual installation steps were:
$ dpkg -x openprinting-ppds-postscript-ricoh_20160227-1lsb3.2_all.deb
$ cp -a ricoh/opt/OpenPrinting-Ricoh/* /opt
Should printer-driver installation become part of apk, it might be useful to provide one ppd package per vendor, and then also a cumulative ppd-all (for easy installation of network printers).
(from redmine: issue id 5268, created on 2016-03-13)