Steve,
I'm not aware of any IP (patents) that are at issue. I have not heard of any discussion or potential issues of IP that are blocking RDM implementation for a number of years now. The majority of the IP was held by HES, but it was openly put on the table for use in ESTA developing RDM. I'm not aware of any IP licensing requirements by anyone.
Any manufacturer can implement as many or as few messages in RDM as they choose, so yes it is possible to have an implementation that only supports something like Getting/Setting DMX Address.
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Scott M. Blair
RDM Protocol Forums Admin
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