Availability and copyright
The standard version of CAST is currently available for use in education free of charge, though we reserve the right to make a modest charge for registration at some later stage. However it is not freeware and full copyright is retained by the author, W. Douglas Stirling.
CAST must not be modified
CAST contains a collection of Java applets (small programs) embedded in a series of html pages that also contain textual material.
The complete CAST package must not be modified, even if it is downloaded to a local hard disk, file server, or web server. No parts of CAST may be used outside the CAST package without the author's prior permission.