Just to be clear, licenses for Cakewalk software are non-transferable and resale is a violation of the license agreement. Therefore, you are the sole owner of any licenses purchased for Cakewalk software. Further, you can only use SONAR on one machine at a time for each license. A serial number and product registration does not constitute a unique license for each version of SONAR. The license covers all versions owned by a single individual. However, an individual can own more than one license and therefore, can run the software simultaneously for each license.
I believe that covers it.
Kind regards,
Living Room Rocker