Libre Office Writer
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Under “File”, select “Export to PDF”
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In the window “PDF options”, select “Archive PDF/A-1a (ISO 19005-1)” and export the document by clicking on “Export”.
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Save the document in the usual manner.
CZE
Under “File”, select “Export to PDF”
In the window “PDF options”, select “Archive PDF/A-1a (ISO 19005-1)” and export the document by clicking on “Export”.
Save the document in the usual manner.