A method for processing packets with encrypted data received by a client from a server through at least one network wherein the data packets comprise at least an encryption header (46) and payload (45), extracting the encryption header (54, 55; 69) from a data packet, extracting and decrypting the encrypted payload to form a clear data, generating a clear data packet segment. Secure packet-based transmission of content data from a server to at least one client comprises retrieving a clear data packet comprising an unencrypted payload, dividing the unencrypted payload into one or more segments, applying an encrypted algorithm to each segment to generate encrypted segments (47), generating encryption header for each encrypted segment composing a packet with encrypted data for each encrypted segment comprising the encrypted header (46), a data packet header and transmission of each of the composed packets to the client.