Add some additional search techniques

notes.md

@@ -2,6 +2,34 @@ This file contains free-form notes.  Anyone working on this project,
 please feel free to reformat this (including to something other than
 Markdown) if you want.
 
+# Some additional license search methods
+
+Databases licensed under BUSL:
+
+https://dbdb.io/browse?license=business-source-license&q=
+
+(those that we don't already have are ArcticDB, Dragonfly, Memgraph, evitaDB, ReadySet, and SurrealDB)
+
+Licenses indexed there that I'm not familiar with and that we should double-check for possible
+DOSP-nature:
+
+```
+Code Project Open License
+Commons Clause License
+Elastic License v2
+Fair Source License
+Microsoft Reference Source License
+Mulan PubL v2
+OpenLDAP Public License
+Open Software License 3.0
+Parity Public License
+Server Side Public License
+VoltDB Proprietary License
+```
+
+We can also do a search for particular SPDX values, like "BUSL" or "BUSL-1.1", in a SPDX line --
+probably on GitHub!
+
 # Examples
 
 Note that some of these examples are still just pointers that will