Dear Rich: I developed an Excel Workbook for use by business brokers. I have allowed business brokers in our parent company to use this Excel pricing model. I filed a copyright on the software and received a trademark on the name for the software. I have also used a third-party compilation software to compile the program so I can set an expiration date, EULA, etc. The program now requires a registration key that is locked to a specific computer. My question is what right do I have regarding the copies of the Excel version that are being used by people in our parent company? Can I require them to destroy the Excel files and use the compiled (executable) version? I'm so glad you asked. Assuming that you developed the software in the course of your employment, then your company owns the copyright under work made for hire rules. And assuming you are using the standard definition of "parent company," there's a strong possibility that the parent owns the assets of your subsidiary company, including the intellectual property. So, under those facts, you would not be in a position to tell them what to do with the software (since they would own it).