Oh no, looks like NVIDIA gave OBS GeForce NvFBC access before Looking Glass could legally use it. *sigh*
And you bet the license to use GeForce NvFBC in OBS will be ultra restrictive. It’s not an opening of use cases, it’s a “strategic deal” with Jim from OBS meaning it was a business deal to get GeForce NvFBC working. (I thought this was an open source project…)
NvFBC is available for Linux, but expect the same licensing restrictions. Whether that will open up for GeForce cards is unknown.