Just read this on Hidglobal.com. Persons wishing to gain illicit access to secure areas may wish to due so by using counterfeit ID cards. To thwart such efforts, many companies are learning to implement visual security elements (VSEs) that are harder to fake than just showing a guard a sham photo ID. These VSEs come in layers — overt, covert, and forensic — with increasing levels of security. Furthermore, multiple security layers can be incorporated in the same ID. See more detail of these innovative concepts in the article.
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Customer trends in advanced visual security for credentials | HID Global