In a message to QL Forum members on October 26th 2013, Rich Mellor wrote:

“Paul Holmgren and Frank Davis who own the US rights to QDOS have now confirmed that they are willing for QDOS to be distributed freely with emulators in the USA and Canada.

There is a minor proviso on that, in that Paul / Frank would like to be kept advised of any projects which are developed using QDOS and sent a copy.”

Although this was already widely taken to be the case, this has now confirmed and settled any doubts on this issue.