... 4 Copyright ( C ) 1989 , 1991 Free Software Foundation , Inc ., . ... 6 Everyone is permitted to copy and distribute verbatim copies . ... 16 Foundation ' s software and to any other program whose authors commit to . ... 23 have the freedom to distribute copies of free software ( and charge for . ... 31 distribute copies of the software , or if you modify it . ... This License applies to any program or other work which contains . ... You may copy and distribute the Program ( or a work based on it , ...