The contents of "src/ucsc" fall under the license below. Note that
the "src/lib", "src/inc" and "src/utils" refer to directories within
the original Kent source tree. In rtracklayer, the files are all under
"src/ucsc".

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 users.