Most files in the CMU AI Repository also appear on the Prime Time Freeware for AI CD-ROM publication. In general, the only files that don't appear on the CD are: + Files with export restrictions, such as implementations of cryptographic algorithms + Files of a time dependent nature, such as calendar of events + Files which the authors didn't want to appear on the CD, for whatever reason (very few of these). + Files added to the repository since the CD was pressed. Of course, such files will appear on the next CD.