http://www.agid.gov.it/sites/default/files/repository_files/linee_guida_per_...
"4.1 Formato del documento Il documento predisposto per la firma dal SP rispetta le specifiche PDF versione 1.7 o successive, profilo PDF/A-2a, secondo lo standard ISO/IEC 32000-1 ..." Fermo restando che secondo me non è corretto indicare l'ISO 32000-1, o comunque lo è parzialmente, perchè questo è lo standard che specifica la versione 1.7 di PDF. Sarebbe stato meglio riferirsi all'ISO ISO 19005-2-2011 Level A, che invece propriamente definisce il PDF/A-2a. Poi un commento personale, io non so se c'è e quale potrebbe essere un formato migliore di PDF, tuttavia io la penso come la Free Software Foundation che definisce il PDF un formato "opaco". A “Transparent” copy of the Document means a machine-readable copy, represented in a format whose specification is available to the general public, whose contents can be viewed and edited directly and straightforwardly with generic text editors or (for images composed of pixels) generic paint programs or (for drawings) some widely available drawing editor, and that is suitable for input to text formatters or for automatic translation to a variety of formats suitable for input to text formatters. A copy made in an otherwise Transparent file format whose markup has been designed to thwart or discourage subsequent modification by readers is not Transparent. A copy that is not “Transparent” is called “Opaque”. Examples of suitable formats for Transparent copies include plain ASCII with-out markup, Texinfo input format, LaTEX input format, SGML or XML using a publicly available DTD, and standard-conforming simple HTML designed for human modification. Opaque formats include PostScript, PDF, proprietary formats that can be read and edited only by proprietary word processors, SGML or XML for which the DTD and/or processing tools are not generally available, and the machine-generated HTML produced by some word processors for out-put purposes only.