Resumen
The article focuses on authorization management for digital library. University information services need unobtrusive but effective means of providing different members different levels of service. Safe Dealing (SD) is an authorization mechanism motivated by information delivery that has many other potential applications among popular services. SD's extreme target is the circumstance in which some user requests a valuable Internet service of a server. This server should grant the request only if the requester is appropriately authorized. Furthermore, the requester will want to avoid sharing personal information beyond what is reasonable for the transaction at hand. In fact, SD can deny digital servers any information about any user except the Internet Protocol address to which they should deliver results and can still reliably limit delivery as specified by service proprietors' policies. SD must enable somebody to trace any suspect transaction back to its human originator. SD limits this to transaction clearance centers made trustworthy by business controls and audits not practically or economically exercised in large numbers of individual servers.