We have all dealt with PDF files at one point or another in our time on the internet or in the office. From tickets purchased online, to business documents from work, school, or government ...

Free student subscriptions to the NYT ended due to rising costs. Adobe licenses, previously free, will cost students $80 a year.

Mary Cunningham is a reporter for CBS MoneyWatch. Before joining the business and finance vertical, she worked at "60 Minutes," CBSNews.com and CBS News 24/7 as part of the CBS News Associate Program.