Posts
Official blog about PDF4QT software
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Encrypting a PDF document with a strong encryption algorithm or decrypting it
Lectures ·When you want to protect a sensitive PDF document from unauthorized access, you may want to encrypt it using a strong encryption algorithm. Standard PDF 2.0 offers two ways to encrypt a PDF document. The first is password protection, the second certificate protection. PDF4QT supports the first option by utilizing strong AES-256 encryption, or for backward compatibility, RC4 and AES-128...
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Welcome to PDF4QT
General ·I would like to introduce new software for processing PDF documents. Why start a new project from scratch when we already have poppler or ghostscript, and also popular viewers such as Evince or Okular? All of these are good, but are quite old and lack many functionalities compared to commercial solutions.