just to confirm, the prize is an actual space flight that will be provided by SpaceAdventures, and take-off will be in the US.
With regards to the question about nationality and country restrictions, running this kind of competition is legally quite complex. Even though we wanted to keep the competition open to everyone, in the end we had to restrict eligible countries for legal reasons. However, everyone can take the quiz, and we hope that you will have fun with the videos. There will also be other incentives for participants and voters even if you're not eligible to go to space.
If you have any questions, please feel free to contact the DBA in Space team via email@example.com.
I hope you've enjoyed the competition so far :-),
Marketing Manager - DBA tools, Red Gate Software