Deferred billing, broadcast, electronic document distribution system and method

A receiving computer in a document delivery system having a broadcast center that sends a document as a plurality of encrypted packets and sends account information including key seeds to the receiving computer, the receiving computer comprising:

• a memory;
• a broadcast receiver that decrypts-a packet as it is received and stores only the decrypted received packet in the memory;
• and
• a security engine that generates keys used by the broadcast receiver to decrypt the received packets in accordance with a one-way hashing method based on a document ID of the sent document and one of the key seeds.

A method for document delivery in a network system, including the steps of:

• sending, by a broadcast center in the network, a document as a plurality of encrypted packets;
• connecting a communication link to the broadcast center;
• decrypting a received packet, in a receiving computer connected to the communication link, the receiving computer including a memory and a broadcast receiver, wherein the broadcast receiver performs the decrypting step on the packet as it is received and stores only the decrypted received packet in the memory;
• sending, by the broadcast center, account information including key seeds to a security engine in the receiving computer;
• and
• generating, by the security engine, keys used by the broadcast receiver to decrypt the received packets in accordance with a one-way hashing method based on a document number of the sent document and one of the key seeds.

A method for receiving documents by a receiving computer in a network system, including the steps of:

• connecting a communication link to a broadcast center in the network;
• receiving from the broadcast center, by a broadcast receiver, a document as a plurality of encrypted packets;
• and
• decrypting a received packet as it is received and storing only the decrypted received packet in a memory in the receiving computer.