Great security is one of the reasons why so many people use PDF format. A PDF author can set password to prevent readers from opening it, or set restriction for copying the text or printing the PDF document. They are the “User Password” and “Owner Password”.
But the security also bothers many PDF users. In [...]

One biggest advantage of PDF is the ability to secure the document. So it is the most popular file format used for document distribution. Last time, I wrote an article mainly about PDF owner password, which can limit a user’s ability to copy text from a PDF document or even prevent a user from printing [...]

Many people complain that they cannot read, copy, edit, and print their PDF files as they don’t have or forget PDF password. Actually, you may not know that, there are two types of PDF password: The one who create PDF files can either protect the PDF files from editing, copying and printing or he can [...]