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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