The files: libdwarf.h dwarf.h and all the .h and .c files in this implementation of libdwarf 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 The libdwarf documentation: libdwarf2.1.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. libdwarf2p.1.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. 17 March 2014:Updated to remove reference to dwarf.v2.mm.