In such cases, I use the Windows 7 snipping tool, or any other screenprint solution (like print-screen key + Paint) in older version of Windows.
I have problem. For homework , I need to make a presentation slide of a lesson in our Arabic book and add the translation myself. However the problem is that our book's pdf file is protected by a key. I have installed the key so I can view it but I don't have the permission to copy from it. Is there anyway that I can copy text (Arabic) and pictures selectively from this file?