Sean Murray of Hello Games has revealed that the developer has been in a three year legal dispute with Sky over the user of the word "Sky" in the title of No Man's Sky.
Tweeting over the weekend, the developer wrote, "Yay! We finally settled with Sky (they own the word "Sky"). We can call our game No Man's Sky. 3 years of secret stupid legal nonsense over.
"This is the same folks who made Microsoft change Skydrive to Onedrive... so it was pretty serious.
"On the plus side perhaps this is the real reason Skynet never happened..."
It's good to know that this dispute has now been settled and the game can release with its proper name. Whether this was part of the reason for the game being delayed or not seems doubtful, but you never know.