Licensing question: What does purchasing a score allow me to do?

Hi,

I hope this is the right forum for my question.

My intention is to publish a song, non-commercially, in an original arrangement with my voice and The Crown main theme (first two minutes). If I buy the score from MuseScore, what does this allow me to do? Does it allow me to incorporate midi from the score in a DAW (Garageband), and export a finished song to Youtube? [I have no intention to make money from this - it is purely for enjoyment.]

TIA.

Colin Goldberg