sentences:  Any country may "provide otherwise" in its legislation.To do so, it is not necessary to include an explicit exception in the domestic copyright law, as the example of the United States shows.The Berne Convention also states in article 5(2) that the enjoyment and exercise of copyright
  
  This specifies national treatment, and also makes the existence of copyright on a work in one country independent from the existence of copyright on the work in other countries ("lex loci protectionis").