[any ANONYMOUS forum user]

I downloaded and installed Tools 3.8a which contains latest calibre plugins for Kindle Mobi and Kindle K4PC. Received error from calibre on DRM removal importing AZW files, but after converting AZW to MOBI format, removing the MOBI from calibre and re-importing the MOBI files, calibre imported the MOBI files without any error-removing the DRM from the MOBI. Are AZW files supposed to be able to have DRM removed using calibre plugins? Also exactly what is a PID?