Adobe no longer sells CS6 or earlier licenses. However, you can sometimes find legitimate, transferable licenses on secondary markets. Be cautious: Adobe’s End User License Agreement (EULA) for CS6 does not allow resale except under specific conditions. Your safest bet is to contact Adobe directly and ask about legacy licensing – though they will almost certainly push you toward Creative Cloud.

Adobe has never released Illustrator 9.0 as open-source or free software. Even though the product is discontinued and completely unsupported, downloading it without a legally purchased license remains a violation of copyright law. Activation Server Shutdowns

Websites that promise free serial numbers, activation codes, "cracks," or key generators (keygen) for older Adobe products are almost always traps. Because Adobe no longer sells or supports Illustrator 9.0, malicious actors use the nostalgia or demand for vintage software to target unsuspecting users.

It is highly likely that any link claiming to provide a serial number for "Adobe Illustrator 9.0" (a version released in 2000) is fraudulent, unsafe, or leads to broken, outdated content . Searching for such serial numbers is risky, as these "keys" are often attached to malicious files or phishing sites.