Not without obtaining a license transfer from Spectrasonics. The sounds and software are licensed and registered ONLY to you. You cannot automatically transfer the license to someone else, and therefore you cannot simply sell it used. If you do attempt to sell it used without obtaining a license transfer, the buyer will not be able to use the product because it is registered and licensed to you. The Omnisphere license is the right given to a single person to use the instrument. When you purchase the product, you are primarily purchasing the lifetime right to use the product and the sounds it contains in your own music projects. Also, if you sell any of your computers that have a Spectrasonics instruments installed on them, you are required to delete them first from the hard drive.