The tickets are so coveted the NFL wages a continuous cat-and-mouse game with counterfeiters.
This year, tickets will feature heat-sensitive ink that disappears when holders blow on it; as well as an onyx hologram that features the NFL logo, said Paula Guibault, senior counsel of the NFL.
Those are the security features the NFL is making public. At least six other "covert aspects" will be added, Guibault said.
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