For one, getting advertisters to commit to buys once a year doesn't make much sense for the TV industry, and it certainly doesn't work for the Internet, which doesn't have the same inventory constraints.
"We didn't pay a great deal of attention to the security side of the Internet when it was first being designed because we didn't really know if it would work at all, " Cerf said in the keynote address at Georgia Tech's annual security summit.
Online books didn't work out too well, but O'Reilly had the idea of putting Internet kiosks in bookstores as a way of promoting the Whole Internet User's Guide and Catalog.