This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
If the applet is signed, and the certificate is accepted by the user, then no policy change should be required. It may also be necessary to run the printing code as privileged code, as is described here. What problems is he encountering?