Copy and Print Locked PDF files
You cannot print, copy or edit locked pdf files. Pdf files can be protected in two ways: one, a password is required to open a file and two, the file can be opened but you cannot use it for printing, copying etc.
FreeMyPDF can unlock the second type of protected pdf file mentioned above. Just upload your file and get a new file without restrictions. Best of all, no signup is required and its free!
This doesn't work for those files which require a password to open. Since this is a website, it would make sense to avoid uploading confidetial pdf files. Consider a desktop app for that.