I keep hearing from engineers who can't donate that I should do something like sell a box with an Octave CD in it or a piece of paper that says it's a license b

I keep hearing from engineers who can't donate that I should do something like sell a box with an Octave CD in it or a piece of paper that says it's a license but not actually do much beyond that, maybe only a vague promise to give priority support. It's a donation in all but in name so that the accounting department will approve it.