http://www.pdfunlock.com/

PDF files can have restrictions that prevent you from for example copying text from them or editing, printing ormerging them. PDFUnlock! can remove these restrictions (a.k.a "owner password").
 If a password is required to open the uploaded file, you will be asked to enter it (a.k.a "user password"). PDFUnlock! cannot, however, recover lost or unknown user passwords.
A PDF file can also be subject to non-standard encryption, such as DRM. PDFUnlock! does not remove such.
Questions or feedback? Leave a comment on our blog, send an e-mail to pdfunlock@gmail.com, or get in touch via Twitter.

refernce
http://www.pdfunlock.com/

Popular posts from this blog

เทคนิค ชนะ เกมเศรษฐี 14 ตารวด!!! ( Let's get Rich )

Using Google Chrome Inspect Element to Analyze the website

Easy way to download whole youtube play list and convert them to mp3