Type of content or material that you are entitled to use without permission
 
The content or material which is not protected under copyright law. For example, if you are using the facts or ideas from a protected work, rather 
than the author's expression;
 
The work which is in, or has fallen into, the public domain;
 
The content or material which is covered by the concept of 'fair use' or 'fair dealing' or by a limitation or exception specifically included in the national copyright law.