You crop a PDF margin. Did the sentence outside it disappear from the file? The published tests for Naepyeon PDF describe a simple check: reopen the saved file and restore the original page boundary.
Restore the boundary
The crop test expects the synthetic marker SECRET-12345 to remain readable after that reset. The implementation changes the viewing boundary rather than deleting the content. Our diagram renames the marker TEST-ALPHA for illustration. We inspected the code; we did not run the application or its tests.
Removal has a scope
The separate redaction test expects something else. After removing the selected region on page one, saving and reopening, its marker should be absent. The same marker on page two should remain. An image test also extracts an image from the saved file and checks whether one originally red source pixel changed. It asks more than whether a rectangle looks black.
V’s view
V’s view. Before sharing a PDF, I want to replace “Did I cover it?” with “What remains, and where?” The viewing boundary, selected region and whole document are different scopes of inspection. Confirming removal in one place does not account for a copy on another page. The useful detail in these tests is that they specify what should remain alongside what should disappear.
Scope: this is an inspection of implementation, test code and the maker’s documentation. The maker reports earlier regression passes but says the design update did not rerun the full engine and security suite. We have not verified successful redaction of arbitrary PDFs or document-wide confidentiality. This is not a recommendation for security-sensitive use.