If you need a guestbook, replace the outdated script with a modern, maintained alternative that includes security features like Captcha, prepared statements, and proper output encoding.
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The fact that these feeds are indexed is typically the result of misconfiguration. While some cameras are intentionally made public (such as traffic cams or tourist webcams), many are not. A properly secured network camera would be placed behind a firewall, not assigned a publicly routable IP address, or configured to require authentication before displaying any video. When these precautions are absent, Google's web crawler can discover the page, index its title and URL, and make it available to anyone who knows the right search terms.
At its core, the syntax intitle:liveapplet inurl:lvappl is a Google "dork," a specific query string used to filter search results with precision. To understand its significance, one must deconstruct its components. The command intitle:liveapplet instructs the search engine to look for pages where the HTML title tag contains the phrase "liveapplet." This terminology is a relic of the late 1990s and early 2000s, referring to Java applets—small applications that ran within a web browser to provide features that standard HTML could not, such as real-time video streaming. The second command, inurl:lvappl , restricts results to URLs containing the string "lvappl," a common directory naming convention used by specific brands of networked surveillance cameras, most notably Panasonic, to host their live view interfaces.