1. A selective encryption encoder, comprising: a packet identifier that identifies packets of a specified packet type, the specified packet type comprising packets carrying data representing a video slice wherein the video slice contains a larger amount of data than a threshold amount of data; a packet duplicator that duplicates the identified packets to produce first and second sets of the identified packets; means for sending and receiving packets to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method; and a secondary encrypter for encrypting the second set of identified packets under a second encryption method.