I bought a Kindle book tonight and I have the .prc file but Calibre is telling me it is DRM protected. I know how to run a mobidedrm but need to know how to generate my pid. I have read 20+ pages in a thread about it but they keep saying my serial number shows up on Amazon but it doesn't. How can I go about generating the PID so I can read these cheap amazon books on my Sony?

Stacy