The files: libdwarf.h libdwarfp.h dwarf.h and most of the .h and .c files in this implementation of libdwarf and libdwarfp are copyrighted according to the file LIBDWARFCOPYRIGHT (which mentions the LGPL version 2.1). Each file mentions the LGPL. The full text of the LGPL 2.1 is provided in LGPL.txt Another copyright used here in some files is the two-clause BSD license, (FreeBSD license). The libdwarf documentation: libdwarf.mm is based on material submitted to the UI PLSIG as proposed interfaces for dwarf, but completely rewritten. Copyright ownership is therefore SGI (but see the document for details) and it seems clear that the intent was there was to be free copying with no fees. libdwarfp.mm is documentation of a set of interfaces (not part of the UI PLSIG proposals) and the document was written from scratch at SGI. Copyright ownership is therefore SGI (but see the document for details) and it seems clear that the intent was there was to be free copying with no fees. 13 June 2021 updated to match the new file structure.