presented at the
DChanges 2014 Workshop
Abstract. Change-tracking of digital
documents leads to document alteration in some manner. Protected
Change-Tracking (PCT) is a response to the question, "How can one
protect word-processing documents against alteration, verifiable by
digital signature, and make signed amendments that are verified to be
allowed modifications of the original document?" A genealogical
model is identified that preserves the digital signature of the ancestor
and each change-tracked descendant. PCT achieves a subset of
genealogical cases having practical simplicity. Applicability to
documents in ODF format is sketched.
2. Genealogical Protection
2.1 Notation: patterns of manifestation
2.2 Document genealogy
2.3 Practical constraints for interchange
3. PCT Approach
3.1 Limiting conditions
4. Supporting PCT in ODF
4.1 Preparing the first generation
4.2 Subsequent generations
OpenDocument Protected Change-Tracking (PCT) is proposed for
protecting OpenDocument documents against alteration, verified by
digital signature, while allowing signed amendments that are verified
modifications of the original document. Having signed additions to
unmodified signed originals is intended for turnaround-document
applications using ODF Text documents and Spreadsheets such as request
forms, expense reports, insurance claims, purchase orders, certain kinds
of electronic ballot, and suitable contract/agreement forms.
The initial formal presentation on PCT was at the
DChanges 2014 Workshop, with the
final publication, downloadable above, revised as the authoritative
version in the subsequent proceedings.
Current activity is on proof-of-concept demonstration based on an
already-sketched high-level approach.
This is a provisional cover for project material, providing an early entry point to the
work. There will be expanded material as the proof-of-concept work
Meanwhile, supporting analysis and exploratory work is also
captured on-line. Precursor material can found and viewed in
additional areas of the nfoWorks site.
PCT OpenDocument Protected Change Tracking Development
This is the hub for analysis and development of the PCT extension
for OpenDocument, starting with Proof-of-Concept work.
listing mini-notebook hypertexts on nfoWorks topics.
Ones catalogued as applicable to PCT and ODF may be useful.
mainly listing developer-oriented technical material, there is
related development content here, such as definitions of namespaces
and production of test cases, along with development of