Here is a link to the article: Michael Jackson, Pirate Remixer
Now the bullet points to the article are:
1) Mike admitted to Darryl Hall that he copped a bass line from him for 'Billie Jean' and hoped Darryl didn't mind.
2) Hall didn't mind because he lifted the bass line from another song.
3) Quincy, the song's producer, hated the bass line but Mike insisted they keep it.
4) History ensued.
In my opinion this is inspiration pure and simple. Case closed. But if you listen to the 2 songs in today's climate, you would probably have a team of