If you already own the software but cannot find your key, check these common locations: PS-300B - Industrial Sewing Machine | Brother

: These credentials authenticate your license and allow you to access advanced features like resizing patterns and importing external data. Where to Find Your Credentials

When you first install or upgrade the PS-300B software, the application will prompt you to enter a upon its first startup.

: The valid credentials are provided by Brother Industries, Ltd. at the time of purchase. They are printed on the packaging of the version 1.0 (or newer) CD-ROM.