ISO 19005-2:2011 defines the PDF/A-2 file format, a version of PDF specifically designed for long-term archiving and preservation of electronic documents. It ensures that documents retain their visual appearance and structural integrity over time, independent of the tools and systems used to create or render them. Essentially, PDF/A-2 is a "locked" version of PDF that eliminates features that could cause problems with long-term preservation, like font linking, to guarantee the document's readability and appearance in the futur
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