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 [...]
PDF (Portable Document Format) is a file format created by Adobe Systems in 1993 for document exchange. According to Adobe, PDF has advantages such as, Multiplatform, Extensible, Trusted and reliable, Rich in file integrity, More secure, Searchable and Accessible. Therefore it is one of the most popular file formats either for daily or commercial use. [...]
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Imagine that you are a lawyer who received a contract from your co-worker in PDF format and find there are several crucial items need to be modified. You do not have the original copy in word and your coworker is now on a vacation you cannot even connect him now. The contract is urgent, then [...]
