We fully decrypted Google’s SearchGuard anti-bot system, the technology at the center of its recent lawsuit against SerpAPI.
After fully deobfuscating the JavaScript code, we now have an unprecedented look at how Google distinguishes human visitors from automated scrapers in real time.
What happened. Google filed a lawsuit on Dec. 19 against Texas-based SerpAPI LLC, alleging the company circumvented SearchGuard to scrape copyrighted content from Google Search results at a scale of “hundreds of millions” of queries daily. Rather than targeting terms-of-service violations, Google built its case on DMCA Section 1201 – the anti-circumvention provision of copyright law.
The complaint describes SearchGuard as “the product of tens of thousands of person hours and millions of dollars of investment.”
Why we care. The lawsuit reveals exactly what Google considers worth protecting – and how far it will go to defend it. For SEOs and marketers, understanding SearchGuard matters because any large-scale automated interaction with Google Search now triggers this system. If you’re using tools that scrape SERPs, this is the wall they’re hitting.
The OpenAI connection
Here’s where it gets interesting: SerpAPI isn’t just any scraping company.
OpenAI has been partially using Google search results scraped by SerpAPI to power ChatGPT’s real-time answers. SerpAPI listed OpenAI as a customer on its website as recently as May 2024, before the reference was quietly removed.
Google declined OpenAI’s direct request to access its search index in 2024. Yet ChatGPT still needed fresh search data to compete.
The solution? A third-party scraper that pillages Google’s SERPs and resells the data.
Google isn’t attacking OpenAI directly. It’s targeting a key link in the supply chain that feeds its main AI competitor.
The timing is telling. Google is striking at the infrastructure that powers rival search products — without naming them in the complaint.
What we found inside SearchGuard
We fully decrypted version 41 of the BotGuard script – the technology underlying SearchGuard. The script opens with an unexpectedly friendly message:
Anti-spam. Want to say hello? Contact [email protected] */Behind that greeting sits one of the most sophisticated bot detection systems ever deployed.
BotGuard vs. SearchGuard. BotGuard is Google’s proprietary anti-bot system, internally called “Web Application Attestation” (WAA). Introduced around 2013, it now protects virtually all Google services: YouTube, reCAPTCHA v3, Google Maps, and more.
In its complaint against SerpAPI, Google revealed that the system protecting Search specifically is called “SearchGuard” – presumably the internal name for BotGuard when applied to Google Search. This is the component that was deployed in January 2025, breaking nearly every SERP scraper overnight.
Unlike traditional CAPTCHAs that require clicking images of…
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