Full Idea
There are two types of right. A Liberty right is merely a permission, meaning it is not wrong to do it. But a Claim right is a right against intervention, meaning no one has a liberty right to prevent it.
Gist of Idea
Liberty Rights are permissions, and Claim Rights are freedom from intervention
Source
Jeff McMahan (Killing in War [2009], 2.3)
Book Reference
McMahan,Jeff: 'Killing in War' [OUP 2009], p.62
A Reaction
There must also be a third type of right, which requires other people to perform actions on your behalf. If you pay for a book in a shop, you must then be given the book.