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Encryption

Created by Johan van der Knijff on Jul 15, 2013 · last edited by Johan van der Knijff · on Jul 15, 2013 (view history) · 22 versions

Description

PDF permits the use of encryption as a means of restricting access or (re-)use of content. This may range from documents that can only be opened after providing a password, to disabling specific functionality (e.g. printing, copying content).

Risks

Content may become inaccessible if passwords are not known (even though "cracking" is often technically possible, institutions may not be legally permitted to do this)
Printing / copy restrictions may complicated any future preservation actions

Assessment

How to assess whether a particular file is affected by this. Includes tool link(s) + concise description of how we can get the required information from this tool. Use XPath expressions if tool produces output in XML format, e.g. see below:

Tool	Affected if expression returns True
Jpylyzer	`"/jpylyzer/isValidJP2 = 'False'"`

Recommendations

Recommendations on what action(s) to pursue in case file is affected by this problem. Optional.

Example files

Links to example files, preferrably from OPF Format Corpus, e.g. like this:

http://www.opf-labs.org/format-corpus/jp2k-test/resolution/balloon_aware.jp2 - Sample file Aware 3.19 (Capture Resolution)

References

References to literature, etc.