Hi Paul, Thanks for the quick reply. I'll probably run a draft of my work by you, to offer you the opportunity to comment further, probably in a few weeks. Shall I cc: Jim Meyering too? -- Terence On Thu, 25 Aug 2022, Paul Eggert wrote: > On 8/24/22 22:55, Terence Kelly wrote: >> (Plan Zero)  Write a little shell script that (a) downloads the grep-3.7 >> tarball, (b) unpacks it, (c) applies a small patch to a single .c source >> file, which adds roughly ten new lines of code, (d) builds the grep >> executable by calling ./configure, make, and make check, (e) applies my >> stand-alone general-purpose Munger tool to the grep executable, and (f) >> runs the resulting "munged" executable to show how my Munger tool changes >> the behavior of grep. >> >> I'm happy to apply GPL to the script described above.  My reading of GPL is >> that a stand-alone general-purpose tool like my Munger need not be GPL'd >> merely because it touches the grep executable. (I might apply a GNU license >> such as Affero to the Munger tool anyway; I haven't decided yet.) >> >> I'd also be happy to arrange for the patch applied in step (c) above to >> insert a notice that the affected .c source file has been modified. > > This all sounds good. One little thing: the step (3) notice must contain a > relevant date, as per GPL section 5(a). > > Thanks for asking about this. > >