All tests run on an 8-year-old MacBook Air. All results from shipping 7 Mac apps as a solo developer. No sponsored opinion. Real PDF redaction is harder than it looks. The naive approach — draw a black rectangle over text — doesn't actually remove the text from the file. Here's what proper redaction requires. The problem with naive redaction A PDF with a black rectangle drawn over sensitive text still contains that text in the file structure. Anyone with a PDF editor can remove the rectangle and read the original content. This has caused real security incidents. Legal documents, medical records, government reports — all leaked because someone drew a box over text and called it redacted.…