diff --git a/README.md b/README.md
index baddf72..e5bc7a8 100644
--- a/README.md
+++ b/README.md
@@ -1,22 +1,27 @@
 # UFO Event Timeline Processing Tool
 
 ## Copyrights:
-[ufojson](https://github.com/richgel999/ufo_data) tool: Copyright (c) 2023 By [Richard Geldreich, Jr.](https://medium.com/@richgel99) (Apache 2.0 license)
 
-[libsoldout](https://github.com/faelys/libsoldout): Copyright (c) 2009, Natacha Porté (ISC license)
+### Code:
+* [ufojson](https://github.com/richgel999/ufo_data) tool: Copyright (c) 2023 By [Richard Geldreich, Jr.](https://medium.com/@richgel99) (Apache 2.0 license)
 
-[json](https://github.com/nlohmann/json): Copyright (c) 2013-2022 Niels Lohmann (MIT license)
+* [libsoldout](https://github.com/faelys/libsoldout): Copyright (c) 2009, Natacha Porté (ISC license)
+
+* [json](https://github.com/nlohmann/json): Copyright (c) 2013-2022 Niels Lohmann (MIT license)
+
+* Some portions of the specific file udb_tables.h (such as get_hatch_geo, g_hatch_continents) use strings/tables from the ["uDb" project by Jérôme Beau](https://github.com/RR0/uDb).
+
+### Data files (in 'bin' directory): 
+Although the C++ tool itself is open source with a permissive license (Apache 2.0), **any commercial use of the copyrighted data in this repository (in any format, textual, JSON, Markdown, HTML, raw binary records, etc.) may require permission from one or more copyright holders**:
 
-## Data files (in 'bin' directory): 
 * George M. Eberhart - Copyright (c) 2022
-* LeRoy Pea - Copyright (c) 9/8/1988 (updated 3/17/2005)
+* LeRoy Pea - Copyright (c) 9/8/1988 (updated 3/17/2005). Permission was given for use as long as he is attributed.
 * Dr. Donald A. Johnson - Copyright (c) 2012
-* Fred Keziah - Copyright (c) 1958
+* Fred Keziah - Copyright (c) 1958. This poster hasn't been updated in 65 years, so it's probably fine for commercial usage.
 * Dr. Jacques F. Vallée - Copyright (c) 1993
-* Richard Geldreich, Jr. - Copyright (c) 2023
+* Richard Geldreich, Jr. - Copyright (c) 2023. Commercial usage permitted as long as attribution is given.
 * NICAP - Unknown copyright status
-
-Note: Although the C++ tool itself is open source with a permissive license (Apache 2.0), any commercial use of the copyrighted data in this repository may require permission from one or more copyright holders.
+* \*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."
 
 ## Instructions
 
@@ -26,3 +31,8 @@ Currently, the tool is Windows only, but it would be trivial to port to Linux/OS
 
 Here's the output [Markdown file converted to PDF](ufo_timeline_v1_04.pdf). The latest HTML timeline is published [here](http://www.subquantumtech.com/timeline/timeline.html).
 
+## Special Thanks
+
+* Thanks to David Marler, Executive Director of the [National UFO Historical Records Center](http://www.nufohrc.org/), for assistance in recovering Hatch's DOS-era UFO program.
+
+* Thanks to Jérôme Beau, creator of the ["uDb" project](https://github.com/RR0/uDb), for releasing his database tool. His output and code was very useful.