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Sure, but you're thinking about that kind of stuff even slightly, you're not going to be uploading your documents anywhere. I suspect the Venn diagram overlap between "thinks about online security" and "uploads documents to random web sites, even if they cost money" is small.

If it's anything I need to care about privacy with, I'm not uploading it to someone else's server even if I pay for it, I'm doing it locally.

But if it's say, as a friend recently experienced, a handout from a teacher in Corel Draw format, you bet your ass I'm uploading it to whatever the top google result for "convert corel draw to pdf online" is.

I don't pay anything to use HackerNews. How much do you pay?

If time is still money ... way too much!

That is a completely different beast. I was talking specifically about uploading and downloading files I intend to open.