ISO 19005-1 is an International Standards Organization (ISO) Standard that was published on October 1, 2005: ISO 19005-1: Document Management - Electronic document file format for long term preservation - Part 1: Use of PDF 1.4 (PDF/A-1).
This ISO standard defines a standard format (PDF/A-1) for the long-term archiving of electronic documents and is based on the PDF Reference Version 1.4 from Adobe Systems Inc. (PDF 1.4 is largely equivalent to the functionality implemented in Adobe Acrobat 5).
PDFPDF/A files are readable with the Adobe? Reader? software that is available free of charge from the Internet. Additional information is available on www.pdfa.org.