methods and systems for enabling content to be securely and conveniently distributed to authorized users are provided . more particularly , content is maintained in encrypted form on sending and receiving devices , and during transport . in addition , policies related to the use of , access to , and distribution of content can be enforced . features are also provided for controlling the release of information related to users . the distribution and control of contents can be performed in association with a client application that presents content and that manages keys .