In the build-up to Skyblivion's release Bethesda has been rather normal. It's not only let the modders carry on with their competing Oblivion remaster without any legal qualms, but has also been quite supportive—handing over Oblivion remaster keys and inviting them over to Bethesda HQ for tea and sweet rolls...
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'We just kept geeking out': Skyblivion devs were invited to Bethesda HQ and ended up spending the whole day talking about modding with the team and Todd Howard
Source: PC Gamer (opens in a new tab)