content: You do realize that for you to read them on your device it has to download a copy then show you that copy. To get even more technical you will have a copy on your hard drive, and in the RAM while viewing and depending on your hardware and software setup/settings you could also have a copy in the hard drive cache memory, the video card memory and your file systems data loss prevention systems. That's up to five copies so far and I am sure there are a few ways you could get even more just by viewing the files.