What is the difference between the Data Compression Library (DCL) and the PKZIP®/SecureZIP® Toolkit?
The DCL provides data compression and decompression functions only. With it you can compress a stream of data and send the compressed data to the destination of your choice. Destinations include memory buffers, other processes, or files in any format you define. The DCL does not directly support the .ZIP file format. The Toolkit will allow you to use all the functionality of PKZIP/SecureZIP to create and manage zip files using data compression and/or data security.