That document is damaged and can’t be opened. But you think it’s got versions saved, if only you could get at them. How?
Acrobat
Do you use digital signatures in PDF documents, or do you trust your PDF reader to check them? You could be spoofed into trusting forgeries.
Getting the Find feature right for PDF documents is important. With text find already available, the best solution is distinct from that.
For less than the cost of a year of Adobe Acrobat Pro DC, this is the first choice for anyone who needs more powerful editing tools.
For around half the cost of a year of Adobe Acrobat Pro DC, you can have a superb PDF reader with good general annotation and editing tools.
Can you get malware in PDF? How far can you trust a PDF, or could it be a forgery? How to sign PDFs, and what data may remain hidden inside them.
Why don’t some PDFs display properly outside Adobe software? Will PDFs ever become more accessible? And what to do when they get damaged?
An old bug in UTIs can cause problems for apps, and may even crash them. The issue is that macOS can’t always tell what type of object certain ‘files’ are.
How good is Acrobat Pro DC at redacting, checking, and cleaning sensitive documents for publication or distribution? Here are its features worked through.
Passing documents containing sensitive or protected information without leaking that requires redaction – a minefield unless you know what you’re doing.
The Eclectic Light Company 