What is valuable inventory: scraped content in Adsense? How to solve it?

Valuable inventory: Scraped content

As stated in Google program policies, Google may not show ads on pages or apps with little or no value and/or excessive advertising to the user. This includes pages or apps that are scraping or rewriting of content from other sources without adding value. Please see Google’s Webmaster quality guidelines for thin content with little or no added value for more information.

For more information, review the following resources:

• Policy tips for creating high quality sites (part 1)
• Policy tips for creating high quality sites (part 2)
• Webmaster quality guidelines
• AdSense Program policies