Method and apparatus for file sharing between a group of user devices with separately sent crucial portions and non-crucial portions

A communication system and method for operating the same includes a group of user devices and a content delivery network in communication with the group of user devices. The content delivery network selects a plurality user devices from the group of user devices, divides the content into a crucial portion and a non-crucial portions, and encrypts the crucial portions differently for each of the user devices in the group using conditional access encryption. The content delivery network communicates the non-crucial portions to the plurality of user devices, communicates the encrypted crucial portion to the plurality of user devices separately from the non-crucial. The plurality of user devices assembles the crucial portion and the non-crucial portions to form the content.