TrustedPickle is a Python module that can save most any arbitrary Python object
 in a signed pickle file. There are two big differences between this module and
 the standard pickle module. First, TrustedPickle can pickle a module, but the 
standard pickle module cannot. Second, TrustedPickle includes a signature that 
can verify the data's origin before the data is unpickled.

WWW: http://trustedpickle.sourceforge.net/index.html