Iris recognition relies upon the fact that every individuals retina has a unique structure. The iris landscape is composed of a corona, crypts, filaments, freckles, pits radial furrows and striatations. Iris scanning is considered a particularly accurate identification technology because the characteristics of the iris do not change during a persons lifetime, and because there are several hundred variables in an iris which can be measured. In addition, iris scanning is fast: it does not take longer than one or two seconds.
These are characteristics which have made iris scanning an attractive technology for high-security applications such as prison surveillance. Iris technology is also used for online identification where it can substitute identification by password. As in other biometric technologies, the use of iris scanning for the protection of privacy is a two-edged sword. The prevention of identity theft applies horizontally but not vertically, i.e. in so far as the data retrieval that accompanies identification and the data body which is created in the process has nothing to do with identity theft.
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ISPs (Internet Service Provider), BBSs (Bulletin Board Service Operators), systems operators and other service providers (in the U.S.) can usually be hold liable for infringing activities that take place through their facilities under three theories: 1) direct liability: to establish direct infringement liability there must be some kind of a direct volitional act, 2) contributory liability: a party may be liable for contributory infringement where "... with knowledge of the infringing activity, [it] induces, causes or materially contributes to the infringing activity of another." Therefore a person must know or have reason to know that the subject matter is copyrighted and that particular uses violated copyright law. There must be a direct infringement of which the contributory infringer has knowledge, and encourages or facilitates for contributory infringement to attach, and 3) vicarious liability: a party may be vicariously liable for the infringing acts of another if it a) has the right and ability to control the infringer's acts and b) receives a direct financial benefit from the infringement. Unlike contributory infringement, knowledge is not an element of vicarious liability.