
Paper (now also plastic) money, as any other credit money, has only a negligible intrinsic value; they need trust for their usage
Political and economic instability accompanied by a high inflation or high scale of counterfeiting
Biological motives, social, institutional and technical preconditions make the banknotes counterfeiting possible and attractive
As an example of technical preconditions, the dramatic growth of counterfeits made by modern reprographic devices is to be mentioned
Technically more complicated banknotes (e.g. new security features, inks, materials, etc.)
Shorter innovation cycles (e.g. US dollars, Series 1929; 1990 (62 years), 1996 (6 years), 2003(7 years))

There is a limited reason to place any highly sophisticated security feature into a banknote;
if majority of users cannot authenticate it
Sophisticated banknotes need sophisticated expert systems such as
The Catalogue of Currencies
Mission: Professional, simple and effective work with global currencies
In time information (monthly update): New issuing banknotes; changes of Legal Tender/Recall periods; typical counterfeits; upgrades
Genuineness (Overt, Semi-covert, Covert security features): Locations; indications; illustrations; video sequences; detail descriptions of security features and recognition process (knowledge, look, tilt, feel, devices)
Validity: Automatic monitoring of Legal Tender/Recall periods

Permanent Training: Each security feature is linked to relevant training part
Administration: Central or/and local settings, central updating, internal purchase/sale rules, annotations
Knowledge, training, education, survey, recognition, detection, comprehensive databases in time, sample room
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