The announcement had been made following the lawsuit between SEA and PKWARE, Inc. The development of PKZIP was first announced in the file SOFTDEV.DOC from within the PKPAK 3.61 package, stating it would develop a new and yet unnamed compression program. Cooper's DWC, LHarc by Haruhiko Okomura and Haruyasu Yoshizaki and ARJ which stands for "Archived by Robert Jung". Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. These archives could optionally be passed through a stream compressor utility, such as compress and others. These utilities were designed to gather a number of separate files into a single archive file for easier copying and distribution.
They include the Unix utilities ar, shar, and tar. By the 1970s, file archiving programs were distributed as standard utilities with operating systems.
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