2010 10-K: Part I A prolonged outage of our database and network facilities  could result in reduced revenue and the loss of customers. Certain products and services have historically made up a large percentage of our revenue base. Our business could suffer  if sales of these products and services decline. Our business relies heavily on electronic delivery systems and  the Internet. Any failures or disruptions could result in reduced  revenue and the loss of customers. We could face liability for the information we publish, including  information based on data we obtain from other parties. We could face liability related to our storage of personal  information about our users. 50 Customers routinely input personal investment and financial infor- mation, including portfolio holdings and credit card information, on  our websites. We also handle personally sensitive information  through our Portfolio Management Service, managed retirement  accounts, and other areas of our business. We could be subject to liability if we were to inappropriately disclose any user’s personal  information or if third parties were able to penetrate our network  security or otherwise gain access to any user’s name, address, portfolio holdings, or credit card information. Any such event could Defending claims based on the information we publish could be  expensive and time-consuming and could adversely impact our busi- ness, operating results, and financial condition. We may be subject to claims for securities law violations, defama- tion (including libel and slander), negligence, or other claims relat- ing to the information we publish, including our research and ratings  on corporate credit issuers. For example, investors may take legal  action against us if they rely on published information that contains  an error, or a company may claim that we have made a defamatory  statement about it or its employees. We could also be subject to  claims based upon the content that is accessible from our website  through links to other websites. We rely on a variety of outside  parties as the original sources for the information we use in our  published data. These sources include securities exchanges, fund  companies, transfer agents, and other data providers. Accordingly,  in addition to possible exposure for publishing incorrect information  that results directly from our own errors, we could face liability  based on inaccurate data provided to us by others. Most of our products and services depend heavily on our electronic  delivery systems and the Internet. Our ability to deliver information  using the Internet may be impaired because of infrastructure failures,  service outages at third-party Internet providers, malicious attacks,  or increased government regulation. If disruptions, failures, or slow- downs of our electronic delivery systems or the Internet occur, our  ability to distribute our products and services effectively and to  serve our customers may be impaired. The success of our business depends upon our ability to deliver  time-sensitive, up-to-date data and information. We rely on our  computer equipment, database storage facilities, and other office  equipment, which are mainly located in our Chicago headquarters  or elsewhere in the Chicago area. Our operations and those of our  suppliers and customers are vulnerable to interruption by fire, earth- quake, power loss, telecommunications failure, terrorist attacks,  wars, Internet failures or disruptions, computer viruses, and other  events beyond our control, including disasters affecting Chicago.  We maintain off-site back-up facilities for our database and network  equipment, but these facilities could be subject to the same inter- ruptions that may affect our headquarters. We’re not currently able  to immediately switch over all of our systems to a back-up facility.  If we experience a significant database or network facility outage,  our business may be disrupted until we fully implement our back-up  systems. Any losses, service disruption, or damages incurred by us  could have a material adverse effect on our business, operating  results, or financial condition. In 2010, our five largest products based on revenue (Licensed Data,  Investment Consulting, Morningstar Advisor Workstation,  Morningstar.com, and Morningstar Direct) accounted for approxi- mately 59% of our consolidated revenue. We believe that sales of  these products and services will continue to make up a substantial  portion of our consolidated revenue for the foreseeable future. If  we experience a significant decline in sales of any of these products  for any reason, it would have a material adverse impact on our  revenue and could harm our business. subject us to claims for unauthorized credit card purchases, imper- sonation or other similar fraud claims, or claims for other misuses  of personal information, such as unauthorized marketing or unau- thorized access to personal portfolio information.