Certain PDF documents prevent the user from copying and pasting or printing its contents. Not that you have any bad intention, say you need to quote a few paragraph as reference for your report with credit given, it would a waste of time typing everything over again.
The following page contains a free online utility that allows you to upload a locked PDF, once uploaded; a version of the PDF without printing or copying/pasting restrictions is displayed in a new browser window. Proceed to print. Visit Free PDF Unlock Online Utility. Note: The webpage is sort of spammy with lots of ads, search for the upload button and check the term and condition box.
Alternatively, you might find this article on how to extract jpeg from a PDF file very useful.