client.PEM is an unencrypted key for use by the client.

server-nopass.PEM is an unencrypted copy of the server's key.
server-pass.PEM is the server's key encrypted with the DES password 'Alison'.

CA.PEM is the CA's key, and is encrypted with the DES pass-phrase 'cert'.
CAcert.PEM is the CA's self-signed certificate.o