Homebrew added license field support since 2.4.3 release, and since then, we have gradually included the licensing information into all the existing formulae. During this journey, we also work with SPDX team to include licensing information for the existing, very old formulae. Often the case, I would also reference the licensing information in the repology or upstream to get a direrct clarification. In this talk, I am gonna talk about the practices that we have done in the homebrew side and how we can collaborate.