Chess copy right law

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Dezh

I have a question regarding copy right law in chess games. How come people are free to study strong chess players games and puzzles? 

Responses would be really appreciated.

Dragec

Several articles on a subject:

http://www.chesshistory.com/winter/extra/copyright.html

http://www.chessvibes.com/columns/copyright-on-chess-moves-shadows-on-the-wall/

http://interviews.chessdom.com/chessbase-copyright-danailov

http://reports.chessdom.com/news-2009/copyright-chess