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The evolving ZIP format, as defined in a sequence of specifications referred to as the "Application Note" had been in wide use in the computing industry for overtwenty years, and the specification had been freely available for much of that time. Initially, only the latest version of the Application Note was available, but since 2010, PKWARE has made available Application Note Archives. Although the format had not been formally standardized, several standards and widely used software applications had incorporated subsets of the specification based on a particular edition of APPNOTE.TXT. The objective of the standardization activity begun in 2011, as reflected in the approved ISO/IEC 21320-1 standard, was to address related challenges faced by standards developers, including those in ISO/IEC committees:

The standard is available from ISO as ISO/IEC 21320-1Information technology -- Document Container File -- Part 1: Corevia the catalog record at The specification can be downloaded from _ISO_IEC_21320-1_2015.zip

The objective of the effort was to define a profile of ZIP that is compatible with the largest number of existing applications and hence provide the greatest level of interoperability. As of May 2020, existing standards have tended to retain the versions of APPNOTE.TXT used when originally developed as normative references. As of May 2020, the compilers of this resource have not identified a specification that uses ISO/IEC 21320-1 as its basis. Comments welcome.

The ZIP format is designed for cross-platform data exchange and efficient data storage for a set of related files. ZIP_PK is a de facto industry standard, developed, maintained, and openly documented by PKWARE.

The original version of the format was developed by Phil Katz (hence the "PK" in PKWARE). Since the first specification was published in 1990, PKWARE has updated the format as supported in its products and issued new versions of the specification in a document called APPNOTE.TXT. See ZIP_PK for a more detailed history. The formats defined by versions 6.3.2 (September 2007) and 6.3.3 (September 2012) of APPNOTE.TXT are technically identical. Version 6.3.3 of the APPNOTE.TXT states that the changes from version 6.3.2 are "formatting changes to support easier referencing of this APPNOTE from other documents and standards."

As described in _(file_format), a proposed project to create an ISO/IEC international standard for a format compatible with ZIP failed to pass a 2010 ballot of national standards bodies. Instead, a study period was initiated, resulting in recommendations documented in ISO/IEC JTC 1/SC 34 N 1621. The recommendations were (a) to have PKWARE continue its maintenance of the ZIP Application Note, (b) to plan for a new multi-part ISO standard to build on top of the ZIP Application Note, and (c) to propose a new work item for Part 1 of the new standard for a Document Container File. The new work item was approved in August 2011 and ISO/IEC 21320-1 - Information technology -- Document Container File -- Part 1: Core was published in 2015.

This format is designed for cross-platform data exchange and efficient data storage for a set of related files. ZIP_PK is a de facto industry standard, developed, maintained, and openly documented by PKWARE. The original version of the format was developed by Phil Katz (hence the "PK" in PKWARE). ZIP_PK combines data compression, file management, and data encryption within a portable archive format. A ZIP file is a package containing one or more files, usually compressed and sometimes encrypted. The basic structure consists of a sequence of chunks comprising a "local file header" followed by the file data (after compression and/or encryption) followed by a chunk known as the "central directory," which lists the files in the package along with key metadata to support their extraction, decryption, etc. Over the years the format has been extended by PKWARE to adapt to new expectations of users and to changing technology, for example, to allow improved methods for compression and encryption, to support larger file sizes, and to support UNICODE UTF-8 for filenames. See Notes below for more detail on chronological versions.

In the past, PKWARE provided public access only to the most recent Application Note. In association with the standardization of Office Open XML (OOXML) as ISO 29500:2008, access was also provided to the version 6.2.0 explicitly incorporated into that format specification. PKWARE now provides access to an archive of selected versions of the .ZIP Application Note.

See Notes below for a chronology of versions of APPNOTE.TXT introducing significant new features to the format. Changes between version 6.3.2 (2007) and version 6.3.3 (2012) of APPNOTE.TXT do not reflect changes in the format, but rather editorial and layout changes based on discussions with an ISO working group that studied the ZIP format. Changes, such as adding paragraph numbers, were made to making it easier for ISO standards to reference the ZIP specification in an unambiguous and reliable way.

ZIP support continues to extend. In 2015, ISO/IEC 21320-1 was published as an international standard for a container based on the ZIP format for digital documents that comprise multiple files, using a subset of features that can be freely implemented. See ZIP_21320_1. Support for opening ZIP files has been added to iOS. Starting with iOS 7 (2013), ZIP files received via Mail or Messages could be opened. More general support was added in 2018 with the Files app, added in iOS 11. The Files app allows users to see the contents of a ZIP file, and extract files. For Android, a number of apps exist. Comments welcome..

According to Our Founder -- Phil Katz, on the PKWARE website (as of February 2013) the original developer's "decision to dedicate the .ZIP extension and file format specification to the public domain helped the .ZIP file format become a globally open standard." As a result, many utilities for creating or reading files in the ZIP_PK format have been and can be developed without separate license agreements. Two mechanisms supported by more recent versions of the format are covered by PKWARE patents: portions of the strong encryption technology support; and a technique for issuing and incorporating patches to content previously distributed as ZIP archives. Tools that manipulate ZIP files but avoid use of these mechanisms can be developed without license concerns. See Notes below for more detail on the scope of PKWARE patents and licensing.

ZIP_PK in the international standards environment: As described in _(file_format), a proposed project to create an ISO/IEC international standard for a format compatible with ZIP failed to pass a 2010 ballot of national standards bodies. Instead, a study period was initiated, resulting in recommendations documented in ISO/IEC JTC 1/SC 34 N 1621. The recommendations were (a) to have PKWARE continue its maintenance of the ZIP Application Note, (b) to plan for a new multi-part ISO standard to build on top of the ZIP Application Note, and (c) to propose a new work item for Part 1 of the new standard for a Document Container File. The new work item was approved in August 2011 and the standard was published in 2015, as ISO/IEC 21320-1:2015 - Information technology -- Document Container File -- Part 1: Core.

The purpose of this template is to simplify the drafting of International Standards and similar publications by providing a document "skeleton" that incorporates a range of predefined stylistic and structural rules, as well as ensuring that the electronic files of the document can be processed easily by the ISO Central Secretariat and other members of the ISO infrastructure. This aid to authoring is designed to save time and effort in the preparation and processing of standards by providing on-the-spot help concerning the drafting rules specified in the ISO/IEC Directives.

See protocol description, 2dParityFEC for details.File: 2dParityFEC-Example.cap.gzDescription: Example of row and column FEC data mixed with MPEG2 transport stream data in standard RTP packets.

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