Well.. check out PDFUnlock!
According to the website:
PDF files can have restrictions that prevent you from for example copying text from them or editing, printing or merging them. PDFUnlock! can remove these restrictions (a.k.a "owner password").Simply visit their website and select the BROWSE button to locate the file on your system.
The website will analyze your file and unlock any restrictions. The maximum file size is 10MB.
Try it and let us know what you think - leave a comment below.