Deepak was a music producer who enjoyed traveling the world. While in the rainforest, he discovered a native tribe who created beautiful music and began to record them. He later brought the recordings back to his studio in Los Angeles and used samples from the recordings in his latest tracks. Has Deepak violated the intellectual property rights of the Brazilian tribe?

a. Yes, they are the original authors and they do not need to register their work in order to be protected.

b. Yes, because he made a profit off of the recordings.

c. No, because he only used a sample from the songs.

d. No, because the tribe did not have copyright protection over their music.