Well, I had a more holistic open source agreement in mind. In such an agreement any configuration information should be included with the source code. Also any

Well, I had a more holistic open source agreement in mind. In such an agreement any configuration information should be included with the source code. Also any custom hardware should also be specified and all rights provided as part of the agreement. Regardless of how incidental the software is, if the software and configuration is all open source, then it is always possible for a talented engineer or group thereof to pick up the services where the previous contractor leaves.