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/
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