Nobody should try to use 7th ed code in other projects, regardless of license. At this point in time it's of historical and educational interest only (it won't

Nobody should try to use 7th ed code in other projects, regardless of license. At this point in time it's of historical and educational interest only (it won't even compile with a modern C compiler...) As it happens I believe 7th ed is now under a bsd-ish license due to http://www.tuhs.org/Archive/Caldera-license.pdf http://www.tuhs.org/Archive/Caldera-license.pdf