In practice, you can always send out an unlimited amount of documents. We, however, have a fair use policy that every license you purchase, comes with an extra user and 50 documents per month or 600 a year. This is dependent on whether you purchase a monthly or yearly plan. If you, for example, do not need the extra user but need extra documents, we still request you to add an extra license to your subscription. Here you can see how you can add an extra license.
There will never be a block to your account unless you have received a warning with the question to upgrade your account to follow our fair use policy regulation.
You can share the number of documents that come with the subscription amongst all users.
If you e.g. have a business plan with 5 licenses you are allowed for 1 person to e.g. send out all the documents that come with the purchased subscription.