Sometimes you want to share a PDF with someone, yet hide some of the information. For example, you may need to provide a bank statement to someone to prove you have a bank account, but not want to show the balance.
There are a number of ways you can do this, and one way that has been common for many people is using apps to pixelate the text you want to hide. But a security researcher has shown that this sort of pixelization is reversible.
Fortunately, if you use a Mac, you have access to a much more powerful redaction tool in Preview, the app you can use for viewing PDFs and images.
Read the rest of the article on The Mac Security Blog.