The digital signature features defined in APPNOTE.TXT are prohibited.The encryption features defined in APPNOTE.TXT are prohibited.Files stored in document container files may only be stored uncompressed or using the "deflate" mechanism as defined in RFC 1951.The specification consists of restrictions in relation to the full ZIP specification, referred to by specific paragraph numbers in the PKWARE Version 6.3.3 of APPNOTE.TXT. ZIP_21320_1 describes itself as a compatible profile of ZIP_6_3_3. In November 2012, a working draft of ISO/IEC 21320-1 of the proposed standard was made available for discussion. The new ISO "work item" was approved in August 2011. Interoperability within the domain of Document Container Files than permitting all features of the interoperability within domain: is there a technology subset that will provide greater.cultural and linguistic adaptability: is the Zip Application Note sufficient by itself, or is additionalĮxpository material needed to define best practices for global use, e.g.There a subset that may be freely implemented? intellectual property rights: what, if any, patents are necessary to implement this technology, and is.It be ensured that this reference remains available? stability of reference: what is the correct reference to give for the Zip Application Note and how can.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: 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. Initially, only the latest version of the Application Note was available, but since 2010, PKWARE has made available Application Note Archives. Twenty years, and the specification had been freely available for much of that time. 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 over See ZIP_PK for more on the ZIP File Format in general. The development of ISO/IEC 21320-1:2015 - Information technology - Document Container File - Part 1: Core was an activity under ISO/IEC JTC 1/SC 34/WG1 to develop a refinement of the widely used ZIP format from PKWARE that would use a subset of ZIP features to support royalty-free use as a container for documents. Profile of ZIP File Format, Version 6.3.3 from PKWARE. ISO/IEC 21320-1 Information technology - Document Container File - Part 1: Core Container-bundle, binary, structured, compression
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