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Companies must ensure people know when they are interacting with artificially generated images, audio and text designed to look real

Most mass scrapers, on the other hand, simply grab the raw HTML underneath. ShieldFont exploits this difference through an automated process called OpenType glyph substitution.

That said, because the whole defense rests on scrapers reading code rather than screens, taking a screenshot of a shielded page and running OCR on the image can still recover the real words.

Screen readers used by blind readers also work from the code, so they read the decoys aloud. ShieldFont ships with a beta feature that provides those readers with the real text instead.

In 2023 and 2024, Flock sent 1,427 alerts to the Roseville [CA] Police Department.

Roseville police found that Flock misread license plates in 71% of those alerts.

Max Isaacs, director of technology law and policy with the Policing Project at New York University's School of Law, described Roseville's misread data as "stunning."

"A 71% misread rate is really beyond the pale," he told Business Insider, referring to Roseville's reported error rate for stolen and felony vehicle alerts. He added that "in the absence of concrete rules that directly address the problem of misreads, this technology is not safe to be deployed in communities."