Flying Null Limited

David Howard Arnold

Michael David Crossfield

Michael John Abrams

Systems and techniques are disclosed wherein a method of providing a security code for a document comprises applying a first magnetic feature capable of being read by a contactless magnetic reader and having a fixed magnetic signature selected from a set of magnetic signatures, and applying a second magnetic feature capable of being read by a contactless magnetic reader and characterized by its magnetic signature and its spatial location on the document. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

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Surrey, United Kingdom

David Howard Arnold