The first program I want to recommend is QPDF, which is free, open source, and works on both Windows and macOS and Linux. To find out more, please continue reading: you will find them indicated below. Having made the necessary clarifications above, let's get to the point and let's find out, concretely, how to open password-protected PDF files using some special free programs, For Windows, MacOS e Linux. How to open password protected PDF files for free
In this second case, in fact, it is necessary to carry out a brute force attack on the document, thus trying all the possible combinations of characters until the right one is found, which can take hours, or even days. The owner password can be bypassed quite simply, usually it only takes a few seconds, while the user password is much more difficult to bypass. You should know that, depending on the type of protection applied to PDFs, the password used for them can be of two different types: there is the owner password which protects files against printing or modification and the user password which, on the other hand, prevents the opening of documents by those who do not know the exact keyword.
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