DPK*
DPK are the first three characters of the BMC Software Inc., product, Data Packer/IMS. Data Packer/IMS provides data compression for IMS/VS. It uses character and string compression, integrity checks, and variable-length segment split protection. It includes utilities to support data verification and reorganization.
Reference Sources
Data Sources Software, Volume 2, Computer Associates International, Inc., Ziff Communications Company, 1989.