There are two types of standard encryption methods used as a security measure for PDF files. The PDF file owner can choose to protect the PDF file by applying “user password” or “owner password”. By protecting a PDF file with ‘user’ password, the owner can prevent others from opening the file. If the owner just wants to impose restriction such as prevent printing, copying of text and graphic or modifications, the owner can protect the document with ‘owner’ password. Files protected by both the ‘user’ or ‘owner’ passwords might not be so easy to crack and force open. However, there are some useful applications that can help users if users are stuck with these problems. One of the useful free tools is PDF Unlocker.
To decrypt the ‘owner’ password, users simply drag the protected file to the PDF Unlocker icon. Immediately the tool will decrypt the owner password and remove the restriction imposed on it. Users will then be allowed to print, copy, modify and many more.
To unlock the restriction imposed by ‘user’ password, users have to right click and select “Remove PDF Password” and close the application.
PDF Unlocker works well with Windows Vista, Windows XP and Windows 7.
Download: PDF Unlocker
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