Do not sign up for a docstoc account! You will incur charges on a monthly basis. I contacted customer support to disable my account and not only were they rude, they likened docstoc membership to a gym membership. You have to pay even if you don't use it. So don't use it. Tried to change my settings via the website, but the link for settings doesn't work.
Do not sign up for docstoc unless someone else is paying for it.