This is discussion of data obtained for this study, which was reported in early July. Commenting on the results, Heather Morrison writes, "I recommend against the use of licenses allowing blanket commercial re-use to authors, journals, OA advocates and policy-makers." Why? Because the commercial indexing services index both open and closed-access publications, while non-commercial services are frozen out from commercial sources of data. This, she writes, results in an "increase in monopoly power for Elsevier: anyone can use the CC licensed material to create a competitor to Scopus, however only Elsevier can use their copyrighted work. CC-BY reduces the likelihood of successful competition." We've seen this same problem in open source software as well. There's no reciprocity; commercial enterprises take from the open, but never contribute back, and eventually undermine the open entirely.