You can obtain a monthly subscription where you will be provided with daily updates for the domain of your choice or download one time the whole database from a given time.
Typically, usage of this information is to:
- analyze competition
- find new customers
- security investigation and intelligence (botnet, phishing)
Please don’t be evil with the data, like spamming domain owners with email about your products and services. Most people have antispam solutions (Spam filter) and this way of promoting your business is proven not to be effective.