The source code under "src/ucsc" comes from Jim Kent's source utilities.
Any usage of this code should follow the license restriction.
Note that the "src/lib", "src/inc" and "src/utils" refer to directories within
the original Kent source tree. In CNEr, the files are all under

The following lines are taken from README of Kent's utilities.

This directory contains the entire source tree for the
UCSC Genome Bioinformatics Group's suite of biological analysis
and web display programs as well as some of Jim Kent's own tools.
All files are copyrighted, but license is hereby granted for personal,
academic, and non-profit use.  A license is also granted for the contents
of the src/lib, src/inc and src/utils and python directories for commercial