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QPDF is a command-line program that does structural, content-preserving transformations on PDF files. It could have been called something like pdf-to-pdf. It also provides many useful capabilities to developers of PDF-producing software or for people who just want to look at the innards of a PDF file to learn more about how they work
Click "Download," “Download Unlocked Version” or “Download Unprotected PDF" or another similar link on the unlocker website. After you click the appropriate download link, click "OK" or "Save" in the browser pop-up window and then choose a folder on your hard drive in which to save the new unlocked version of the PDF file. Click "OK" or "Save" to download the unprotected PDF file and save it to the selected folder on your computer