Because he articulate the purpose and distinguishing characteristics of copyright, fair use, open access, and the public domain.
By understanding the difference between each of these characteristics, then chris could fully use the information that he obtained from various sources and legally use it for his own purpose.
There could be a lot of factors that could be a hinder towards a successful escape and these factors may include: The barrier or shield in the facility in which this could be a problem if you don't have the clue of where you're getting out of, the tools that you are going to used can be also one of the problems because you won't know what more tools you need in order for escape and lastly, people you're with or the people who has also been held captive can be a factor because you won't know who to trust.
The third one on the right
The right option is the US dollar has become stronger. When this occurs, purchase power increases if compared to foreign goods and services, enabling US citizens to benefit from those. Certainly, tourist sites getting crowded and dirty is a risk that must counted on, perhaps not the ideal situation for anyone.
Modeling is the answer youre looking for.