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From Herbert Duerr <...@apache.org>
Subject Re: Export of PDF/A-1a faulty ?
Date Thu, 01 Aug 2013 14:30:23 GMT
Hi Guenter,

>> PDF/A is a document format for long term preservation so it has some
>> constraints to facilitate this. See ISO 19005 for details or [1]
>> (provided by the Library of Congress) for an overview over these
>> constraints. Here is the relevant excerpt:
>>
>> - Encryption is disallowed
>> - Audio and video content are forbidden
>> - Javascript and executable file launches are prohibited
>> - All fonts must be embedded and also must be legally embeddable for
>> unlimited, universal rendering
>> - Colorspaces specified in a device-independent manner
>> - Use of standards-based metadata is mandated
>>
>> [1] http://www.digitalpreservation.gov/formats/fdd/fdd000125.shtml
>
> many thanks. Without knowing the details I had in mind, that "archived
> pdf documents" were "revisionssicher".

You probably want the signed PDFs and checking them ensures a PDF has 
not been tampered with. AOO doesn't yet support it [1], but there are
third-party tools for signing the PDF or for encrypting the file itself.

[1] https://issues.apache.org/ooo/show_bug.cgi?id=47895

> Are there tools, to produce readable "really protected" pdf documents?

Depends what you mean. Signing with strong cryptography gives a good 
assurance that it hasn't been tampered with.

Herbert

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