Adsense help

I have one general blog that has some decent organic traffic. I published entertainment articles mostly and I applied for Adsense they keep rejecting me due to copyright content but my all content is plagiarism-free content. any ideas about this how to get approved?

Write at least 80% unique content:

Content is the king. It is the unique content that will help you in getting AdSense approval. But don't worry you don't have to write 100% unique article for getting AdSense approval. Google allows 20% Copyrighted or plagiarized content.