PDF, or Portable Document Format, is a file format created by Adobe in 1993. PDF is widely used because it is displayed in the same manner irrespective of the software and hardware used, making it very convenient for users on different platforms.
However, the reason why most users choose PDF format today is to provide documents without the risk of being plagiarized, that is, content (text, images etc.) cannot be copied from a PDF file easily. Today, ebooks, containing licensed material are sold, and authors may also choose PDF format to prevent their content being published online as crawlable web pages.
However, from the attempts of MPAA/RIAA, we know all too well that any attempt to prevent sharing of files will be met with anger, and several services today offer methods to unlock a PDF file and extract its text and graphics easily.
Here are two tools (one of which is an online PDF unlocker, so that you can access it anywhere) to unlock (or unblock) PDF files.
PDF unlocker – unlock your PDF files
PDF unlocker is a free tool to unlock your PDF files. The convenience is that it is an offline/desktop software, which requires no internet access. Often, PDF files are published online with passwords to prevent unauthorized access to them. PDF Unlocker can be used to bypass this protection and open password protected PDF files.
PDF Crack
PDF Crack is an online PDF unlocking service. You can upload a PDF file, and get back an unlocked and non-restricted version of the same PDF document in a new window. The advantage of PDF Crack is that you do not need to install any software (hence, it can be used on computers where you are not allowed to install software, for example at office).
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Nice tip Sumesh. Thank you very much !
Another online PDF unlocker: http://www.pdfunlock.com.
here is another recovery tool.
it is great!!!
have a try
http://download.cnet.com/PDF-Password-Unlocker/3000-2092_4-10964691.html?tag=mncol