Got a document that requires a password to print or copy text? Hey, you’re the one that set the password and forgot what it was right? Send it on over to FreeMyPDF.com and it will unlock it for you. However: “This only works for PDFs that you can open and read without any 3rd party plugins. PDFs that require a password to be viewed cannot be unlocked by this service.”
The trick is to drag [PDF] thumbnails on top of a thumbnail in the document you’re dragging to. This combines the pages. If you want to rearrange the pages, just drag them where you like–they’ll stay within the combined document. Save your document and you’re done.
Read the full article from PC World