PDF Secure Photocopy

Security: PDF Secure Photocopy

GoodReader offers you a unique feature - Secure Photocopy. It allows you to wipe all hidden, redacted, or otherwise invisible or deleted data and pages from a PDF file.
There have been a few recent high-profile legal and political cases when PDF documents with sensitive information have been redacted by drawing black rectangles over the classified text and released to the public. Later, the journalists have had no trouble extracting this hidden text from the file.
Secure Photocopy - Guaranteed Removal of Hidden, Redacted, or Deleted Elements and Pages

Our unique Secure Photocopy feature makes sure that nothing like this ever happens. It guarantees you that if you don't see information on the visible pages, it is not hidden anywhere in the file. There is simply no way to extract information from a file if it's not there.
To use the feature, open a PDF file, press the Actions button, and select Secure Photocopy.

Secure Photocopy is a part of Pro Pack.
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Very useful

This app is extremely useful in my work. I love being able to annotate documents with my Apple Pencil on my iPad. Whether I am dealing with grad school readings, reports, music that needs annotations, etc., I can annotate for my needs and organize the material. Given that I do some teaching, the annotated notes are really helpful and it becomes a library of my work. It's been useful at developing presentations where I'm using music or text that is highlighted to make my points, or even highlighted in different colors to show layers of information. This app is really handy, and user friendly once you get the hang of it.

Not sacrificing my ptivacy, Review on Apple Store