On dynamic linking

• No copyrights on software interfaces
  
• libtriangle.h again:

    #include <stdio.h>
   
   void triangle (int n);
    

  
  
  • Interfaces are usually non-original
    
    
  • Reimplementing an interface is necessary for functional compatibility
    
    • and functionality isn't copyrightable
      
      
• But implementations are
  
• And copyright on implementations can be infringed by dynamic linking
  
• Independent implementations
  
  • Example: Libeditline
    
  • You can always avoid infringing copyright by writing your own code
    
  • But you have to actually do the work
    
    • libnullreadline is unacceptable
      
  • Header files have "thin" protection
    
    
    

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