Publishers at The E-Book Starting Gate
Buyers can subscribe to access documents online, in which case the documents are simply not downloadable. Individual books have serial numbers; a NetLibrary proprietary program monitors usage. Because book borrowers access the system by entering a log-in name and password, NetLibrary can track system use and flag aberrations. If a user is rapidly viewing multiple pages of an e-book--a pattern that indicates the possibility of page-by-page printing--NetLibrary will display a copyright notice and instruct the user to discontinue his or her actions. If the pattern continues, the account becomes disabled for a period of time and the event is logged for tracking purposes.