A client/server system has a client platform adapted to provide restricted
use of data provided by a serve. The client platform comprises a display,
secure communications means, and a memory containing image receiving code
for receiving data from a server by the secure communication means and
for display of such data. The client platform is adapted such that the
data received from a server is used for display of the data and not for
an unauthorised purpose. A server adapted to provide data to a client
platform for restricted use by the client platform comprises a memory
containing image sending code for providing an image of data executed on
the server, and secure communications means for secure communication of
images of data to a client platform. The server is adapted to determine
that a client platform is adapted to ensure restricted use of the data
before it is sent by the image sending code.