WORKED EXAMPLE · SCANNED PDF REDACTION
Scanned 1983 NASA press kit redacted, then partly un-redacted
A communications team had an 8-page scan of a 1983 NASA press kit to send to a design agency. They asked to black out every phone number and every person’s name, burned into the scan, while job titles, agencies and companies stayed readable.
read the scan and removed 26 names and 5 phone numbers from the page images and from the text, touching nothing else. Then legal relaxed the rule, and went back to the original scan to make a second version with the 13 senior officials visible again.
1The upload: an 8-page scan from 1983, with names and phone numbers
NASA/INDUSTRY TEAM
NASA Headquarters
Lt. Gen. J. A. Abrahamson Associate Administrator for Space Flight
Joseph B. Mahon Director, Expendable Launch Vehicle Program
Peter Eaton Manager, Delta Program
Robert E. Smylie Associate Administrator for Space Tracking and Data Systems
Goddard Space Flight Center
Dr. Noel W. Hinners Director
John J. Quann Deputy Director
William C. Keathley Director, Project Management
Robert C. Baumann Acting Delta Project Manager
William A. Russell, Jr. Deputy Delta Project Manager
Lt. Gen. J. A. AbrahamsonAssociate Administrator for Space Flight
Joseph 6. MahonDirector, Expendable Launch Vehicle Program
Peter EatonManager, Delta Program
Robert E. SmylieAssociate Administrator for Space Tracking and Data Systems
Dr. Noel W. HinnersDirector
John J. QuannDeputy Director
William C. KeathleyDirector, Project Management
Robert C. BaumannActing Delta Project Manager
William A. Russell, Jr.Deputy Delta Project Manager
- 8scanned pages, old OCR text
- 31redactions burned into the scan
- 0redacted names left in the text
- 13names restored from the original
Open the real files
These are the actual files from the run. Download them, zoom in, and try to copy a name out.
Where the file comes from: NASA Technical Reports Server, NASA News Release 83-44, "Press Kit: Project RCA (Satcom 1R)", 31 March 1983. A US Government work, public use permitted.
01 · THE STARTING FILE
Eight scanned pages with a noisy text layer
Every page is a black-and-white scan. The PDF also carries text from old OCR, and that text is noisy: it reads “Joseph 6. Mahon” for Joseph B. Mahon and “Wi11iam Palme” for William Palme. The press contacts are on page 2, the NASA/Industry Team list is on pages 6 and 7, and phone numbers are on pages 1, 2 and 8.
A black box drawn over a scan hides nothing: the picture is still underneath, and so is the text. A real redaction has to change the pixels and delete the words.


02 · REQUEST 1
"Redact every phone number and every person’s name"
What the comms team typed
We're sending this 1983 NASA press kit (Satcom 1R launch) to our design agency as reference for a heritage campaign. Before it goes, please redact: 1. Every phone number: the 'AC 202 755-8370' letterhead number on pages 1 and 2, the two press-contact numbers on page 2, and the recorded-updates number in the note to editors on the last page. 2. The names of individual people: the two press contacts at the top of page 2 and every name in the NASA/Industry Team list on PDF pages 6-7 (NASA Headquarters, Goddard, Kennedy and RCA American Communications), including prefixes like 'Lt. Gen.' and 'Dr.'. Job titles, company and agency names and places stay readable, including company names that contain a person's name (e.g. Charles Stark Draper Labs on page 8). It's a scan, so the redactions must be burned into the page image, not just boxes on top.
What did
- Read all 8 pages and found each name and number on the page, including the ones the old OCR had misspelt.
- Redacted 26 names, with their prefixes (“Lt. Gen.”, “Dr.”, “, Jr.”), and 5 phone numbers: 31 redactions on pages 1, 2, 6, 7 and 8.
- Burned each one into the scan. The black is part of the page picture now, and the words are deleted from the text.
- Left every job title, agency, company and place readable, including Charles Stark Draper Labs on page 8. Pages 3 to 5 were not touched.
Before and after: drag to compare

original scanversion 1Before and after: drag to compare

original scanversion 1
We checked the delivered file: copying out its text finds none of the 26 surnames and none of the 5 numbers, every title and company is still there, it still has 8 pages of the same size, and pages 3 to 5 are the original scans, unchanged.
One thing we would tidy: on page 2 the boxes follow the old OCR’s line boxes, which are a little taller than the type, so they nick the line below; and the word “(Phone:” went with the numbers.
03 · REQUEST 2
"Senior officials can stay visible"
What the comms team typed
Legal has relaxed the rule: senior officials can stay visible. Working from the original scan, un-redact the people in the team list whose title contains 'Director', 'Administrator' or 'President' (so Deputy Director, Network Director, Associate Administrator and Vice President all count). Everyone else, the two press contacts on page 2 and all phone numbers stay redacted. Save it as a new version and list who is now visible.
What did
- Started again from the original upload, not from version 1: a burned-in redaction cannot be undone, and it did not need to be.
- Applied the new rule: the 13 people whose title has Director, Administrator or President in it stay visible; the other 13, the two press contacts and all 5 phone numbers are redacted again.
- Saved it as a new version. Version 1 is still there as the earlier version.
- Listed who is now visible, section by section, with their titles.
Before and after: drag to compare

version 1version 2Before and after: drag to compare

version 1version 2Visible in version 2 13
- Lt. Gen. J. A. AbrahamsonAssociate Administrator for Space Flight
- Joseph B. MahonDirector, Expendable Launch Vehicle Program
- Robert E. SmylieAssociate Administrator for Space Tracking and Data Systems
- Dr. Noel W. HinnersDirector (Goddard)
- John J. QuannDeputy Director
- William C. KeathleyDirector, Project Management
- Ralph BanningNetwork Director
- Richard G. SmithDirector (Kennedy)
- Thomas S. WaltonDirector, Cargo Operations
- Charles D. GayDirector, Expendable Vehicles Operations
- Dr. James J. TietjenPresident (RCA)
- John ChristopherVice President of Technical Operations
- Joseph SchwarzeDirector, Space Systems
Still redacted 13
- press contact, page 2
- press contact, page 2
- Manager, Delta Program
- Acting Delta Project Manager
- Deputy Delta Project Manager
- Manager, Delta Mission Analysis and Integration
- RCA Satcom 1R Mission Integration Manager
- RCA Satcom 1R Network Support Manager
- Chief, Automated Payloads Division
- Chief, Delta Operations Division
- Spacecraft Coordinator
- Manager, Advanced Space Programs
- Manager, Spacecraft Engineering
We checked it: the 13 names that came back are the original scan’s own pixels, with no trace of a box. “Joseph B. Mahon” reads correctly on the page even though the old OCR text still says “6.”. Copying out the text finds the 13 senior names and none of the other 13 or the phone numbers.
Redaction that changes the file, not just the view
Most tools draw boxes on top. takes the words out of the page and out of the text, on scans too, and keeps your original, so a changed rule is a new version instead of a redo by hand.
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