If you’re printing something on actual paper, there’s a good chance it’s important, like a tax form or a job contract.

But popular printing products and services won’t promise not to read it. In fact, they won’t even promise not to share it with outside marketing firms.

Ideally, printing services should avoid storing the content of your files, or at least delete daily. Print services should also communicate clearly upfront what information they’re collecting and why. Some services, like the New York Public Library and PrintWithMe, do both.