Permission Overlays

Title	Permission Overlays
Detailed description	Disk images often contain information to which they should apply access restrictions. This can include deleted files, file fragments, Windows registry hives, and various system files. This particular dataset does not have associated access restrictions, but it is intended to simulate disk images for which restrictions will be necessary. The main question is how to properly mediate user access to parts of disk image, when one cannot simply rely on the permissions embedded in the image's filesystem metadata.
Issue champion	Cal Lee
Other interested parties	Various developers and repository professionals. See e.g. the members of the two BitCurator project working groups: http://bitcurator.net/peoplebc/
Possible Solution approaches	Allow user to dynamically walk the file tree through a web interface such as at http://cgi.cs.indiana.edu/~geobrown/svp Build separate indexes of content and allow users to search over them. See e.g. https://github.com/anarchivist/gumshoe Deliver entire disk images that are unchanged. Deliver entire disk images that have redacted the restricted content. Generate redacted disk images on the fly.
Context	Managed by Naval Postgraduate School, UNC SILS (School of Information and Library Science) and ibiblio for use by educators and researchers.
Lessons Learned
Datasets	Realistic Disk Image Collection for Research and Education
Solutions	Solution Developed by Swithun Crowe