Update README.md

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@ -24,7 +24,7 @@ Although the C++ tool itself is open source with a permissive license (Apache 2.
* Dr. Jacques F. Vallée - Copyright (c) 1993. This data was published in [_Passport to Magonia: From Folklore to Flying Saucers_](https://www.amazon.com/Passport-Magonia-Folklore-Flying-Saucers/dp/0987422480). This is the book's copyright.
* NICAP - Unknown copyright status. The organization went defunct in 1980, 43 years ago, so it's very likely this data is in the Public Domain.
* \*U\* binary database file U.RND: Copyright 1994-2002 [Larry Hatch](https://www.openminds.tv/larry-hatch-ufo-database-creator-remembered/42142). According to David Marler, Executive Director of the [National UFO Historical Records Center](http://www.nufohrc.org/), "The family has verbally given permission for the database to be used. If you need to speak with them, I have their contact info."
* Jérôme Beau - Copyright © 2000- 2023. French chronology data from [rr0.org](https://rr0.org/). See its license [here](https://rr0.org/Copyright.html).
* Jérôme Beau - Copyright © 2000- 2023. French chronology data from [rr0.org](https://rr0.org/). See its license [here](https://rr0.org/Copyright.html) (the GNU Free Documentation License).
* [Godelieve Van Overmeire (1935-2021)](http://cobeps.org/fr/godelieve-van-overmeire) - Her French chronology was explictly not copyrighted, as far as I can tell.
* Richard M. Dolan - Copyright 2009. His compilation of UFO events are from the appendix of the book [_UFOs and the National Security State: The Cover-Up Exposed, 1973-1991_](https://www.amazon.com/UFOs-National-Security-State-Chronology-ebook/dp/B0C94W38QY).
* The [Anonymous PDF](https://github.com/richgel999/ufo_data/blob/main/bin/anon_pdf.md) Markdown file (anon_pdf.md), which originally appeared on the internet [here](https://pdfhost.io/v/gR8lAdgVd_Uap_Timeline_Prepared_By_Another) in late July 2023 in Adobe PDF format, is not copyrighted and is in the Public Domain (i.e. it is not Intellectual Property). All ~600 events were explictly and individually marked "PUBLIC DOMAIN" in the original PDF format document. In any jurisdictions outside the US that don't recognize the Public Domain, this Markdown file (and only the specific file anon_pdf.md) uses the [Unlicense](https://web.archive.org/web/20230426084039/https://unlicense.org/). Here's an [HTML conversion](http://subquantumtech.com/anon_pdf/anon_pdf.html) of this Markdown file, using the [markdown-styles](https://github.com/mixu/markdown-styles) command line tool (you can also use `pandoc -f gfm`):