Four types of works

1. Works based on the Library (that are libraries)
   
   • Example: You add a cube root function to my LGPL math library
   • Must be distributed under the LGPL
     
2. Works based on the Library (that aren't libraries)
   
   • Example: You textually copy the Matrix class from my math library into your 3d game
   • Library must be converted to GPL
     
3. Works that use the Library
   
   • Example: Your calculator source or object files refer to functions the GNU C Library
   • No restrictions on distribution
     
4. Works that use the Library, linked with the library
   
   • Example: You dynamically link your calculator to my math library
   • Distribution is permitted under liberal conditions
     

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