Based on the model number , you are likely referring to a Brother P-Touch labeling system (specifically the PT-300 or similar models in the "PC" series like the PC-300).
Keep the base software CD-ROM inserted in your local disk drive throughout the validation phase. Software Capabilities Unlocked by Successful Validation brother ps-300b key id
Understanding the Brother PS-300B Key ID: A Complete Guide to Software Activation and Troubleshooting Based on the model number , you are
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The PS-300B software utilizes specific keyboard shortcuts and mouse combinations to streamline the design process. Upgrade Procedure - Industrial Sewing Machine | Brother
: Depending on your specific version (such as PS-300B-5040), the Key ID may be tied directly to a physical USB security dongle or "key" included with the retail software box. How to Use the Key ID During Installation & Upgrades