The ‘fake producers’ we should hunt for are the producers who:
Claim to have produced a song when someone else produced it. (Again, the names in the song titles are not automatically claims that they produced it, those are the artists. Producers are in the credits only)
Claim to have engineered a song when someone else engineered it
Claim to have created certain melodies when someone else created them.
Claim to have written certain lyrics when someone else wrote it.
Read the full article here: http://edm.com/blog/ghost-producer