See COPYRIGHTS file in tarball. The main license of the package is LGPL-2.1+. A few files are under a different license: su_addrinfo.{c,h}: BSD (3-clause) su_md5.c: public-domain Files inet_ntop.c, inet_pton.c, getopt.c, strtoull.c, and rc4.c are also mentioned in COPYRIGHTS, but are not used.
I see you have already done all the research, thank you. Please commit.
Fixed.