The TeX license requires you to change the name of you change a single byte.
> All of the methods described in these books are in the public domain; thus anybody can freely use any of the ideas. The only thing I'm retaining control of is the names, TeX and METAFONT: products that go by this name are obliged to conform to the standard. If any changes are made, I won't complain, as long as the changed systems are not called TeX or METAFONT.
> All of the methods described in these books are in the public domain; thus anybody can freely use any of the ideas. The only thing I'm retaining control of is the names, TeX and METAFONT: products that go by this name are obliged to conform to the standard. If any changes are made, I won't complain, as long as the changed systems are not called TeX or METAFONT.