Patent ID: RE42163

Claim:
A system for managing digital data to be transferred from an owner of data to a user of data via broadcast, a communication network or data recording medium , said system comprising: storage storing public-key s , private-key s , user label s and edit label s used in the data management system; a data management center and the owner linked to a public-key the storage, and arranged on said a communication network; wherein said data management center is configured to certify ing public-keys of said owner and said presented by user s of said system and storing said is further configured to access a first user label and said a first edit label associated with a first set of digital data ; a first user device configured to obtain ing said first set of digital data from said communication network by presenting said first user label to use said first set of digital data, wherein said first user device is further configured to edit ing the first set of digital data , and obtain ing said first edit label from said data management center via said communication network by presenting said first user label and an editing scenario , ; wherein said first set of digital data is not only temporarily stored in a said first user device of each of said user after us ing e of said first set of digital data by a first user , and wherein said first user device is configured to transfer said first edit label is transferred to a next user without said digital data for the next user's use of the edited said first set of digital data , wherein the first set of digital data is not transferred to the next user .