The reason why most users choose PDF format to share and transfer documents is because they can be protected by the creator.為什麼大多數用戶選擇PDF格式，分享和轉讓文件，是因為他們能夠得到保護的創作者。 Content, such as text and images, can not be copied or stolen from such PDF documents.內容，如文字和圖片，不能被複製或被盜等文件。
One solution, recommended by一個解決辦法，建議 Ghacks , is to use ，是使用 PDF Unlocker PDF格式Unlocker which is a free PDF unlocking utility that will remove all restrictions.這是一個免費PDF開鎖工具，將取消所有限制。
However if you want to unlock a PDF file without installing any software, I would recommend但是如果你想解開的PDF文件沒有安裝任何軟件，我建議 PDF Cracker PDF格式破解 . 。 It is a Free online PDF Unlock utility.這是一個免費的在線PDF格式解鎖工具。
It works simply by uploading a protected PDF file through your PC and once uploaded, it will open an unlocked and non-restricted version of the same PDF document in a new window.它只是通過上傳一個受保護的PDF文件通過你的電腦，一旦上傳，它將打開一個上鎖和非限制版相同的PDF文件在一個新窗口。
You can try您可以嘗試 http://www.pdffiller.com to fill in pdf forms.填寫PDF表格。 It is probably the easiest way to do that.這可能是最簡單的方法來做到這一點。 You don’t have to install any software.您不必安裝任何軟件。 Just click anywhere and start typing.只要按一下任何地方，並開始打字。 You can print, Email, Fax, or export your form as well.您可以打印，電子郵件，傳真，或出口的形式以及。