A trust evaluation framework exposes a common interface that may be used
by file transfer clients in the process of retrieving or downloading a
file. Using the common interface, each file transfer client can take
advantage of multiple trust providers to evaluate the incoming file. In
this way, disparate file transfer clients can present a common user
experience for downloading or retrieving files. In addition, trust
providers may be updated or added to the system without modifying the
installed file transfer clients. This enables the user experience to be
incrementally improved without updating the installed programs.
