I'm a student and I have a ton of lectures in pdf that I get from all my courses. Since some time ago, I keep getting warning messages when I try to open a pdf file that has been saved onto pdf. There was no warning when I was downloading it from my school website. I'm guessing it's something to do with "trusted publisher." On the bottom of the message, there a box with an option to unselect to have this message not pop up every thime I open. When I unselect this option, it only apply to that specific file and not to others. So, I'm having to do this every single time I try to open a pdf. I have been searching the forums for answers but to no avail. I have no idea why it's "acting up." Help?!
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