4. The system for publishing and distribution of claim 2 further comprising: the host computer is capable of receiving payment from a student for one or more credits, banking the one or more credits in an account, and applying the value of the banked credits towards the purchase of the selected segments of the compilation.
4. The system for publishing and distribution of claim 2 further comprising: the host computer is capable of receiving payment from a student for one or more credits, banking the one or more credits in an account, and applying the value of the banked credits towards the purchase of the selected segments of the compilation. 5. The system for publishing and distribution of claim 4 wherein: the host computer restricts application of the banked credits to purchase of the selected segments of the compilation by a student in the class.