 CBHD uses the PRC government-owned AVS video codec, DRA audio codec, and a new copy protection system, DKAA, as an alternative to HD DVD's and Blu-ray's AACS.CBHD's developers claim the format contains more copy protection features and is part of a big push by China to fight piracy in addition to reducing their reliance upon foreign patents with their associated royalty payments.CBHD also eschews HD DVD's Advanced Content navigation system in favor of a Chinese system called CETC.