Sometimes when opening a PDF file, it will give off a security warning. The warning is displayed for PDF files that are transferred or run programs and macros that can be harmful to your computer.

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Thorin Klosowski There’s no one-size-fits-all solution to computer security, ...

If you've ever owned a car in a city, you may know the rule about break-in's: It's not that you'll never get broken into, but more about making your vehicle look the least attractive to thieves by ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. This post has been updated. It was originally published on June 1 ...