All a web site owner has to do is copy a small piece of code into their web page which will then display the trust seal. When a visitor comes to the web page and clicks on the trust seal they will be taken to a page that shows the site they visited is either safe or display a warning if there are any problems.
Free Trust Seal runs several tests to confirm whether a web site is safe or not. Some of these tests involve port scanning but also rely on other services such as Google's safe browsing diagnostic information for web sites as well as information from Alexa based on a web site's popularity and inbound links.
Other companies offer trust seals with prices ranging from hundreds to thousands of dollars for the service. FreeTrustSeal.com is supported by sponsor advertising.
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Free Trust Seal http://freetrustseal.com offers any web site the ability to display a trust seal at no cost.