diff --git a/data/projjson.schema.json b/data/projjson.schema.json
index b2884953dc..a8578c81e9 100644
--- a/data/projjson.schema.json
+++ b/data/projjson.schema.json
@@ -2,7 +2,7 @@
   "$id": "https://proj.org/schemas/v0.7/projjson.schema.json",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Schema for PROJJSON (v0.7)",
-  "$comment": "This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_DEFAULT_VERSION accordingly in io.cpp",
+  "$comment": "This document is copyright Even Rouault and PROJ contributors, 2019-2023, and subject to the MIT license. This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_DEFAULT_VERSION accordingly in io.cpp",
 
   "oneOf": [
     { "$ref": "#/definitions/crs" },
diff --git a/docs/source/specifications/projjson.rst b/docs/source/specifications/projjson.rst
index 1cfb0e45a8..44063abd41 100644
--- a/docs/source/specifications/projjson.rst
+++ b/docs/source/specifications/projjson.rst
@@ -1111,3 +1111,9 @@ Online CRS definitions as PROJJSON
 
 The https://spatialreference.org/ website features CRS definitions for various authorities under a
 number of formats, including PROJJSON. For example: https://spatialreference.org/ref/epsg/4326/projjson.json
+
+Copyright and License information
+---------------------------------
+
+This document is copyright Even Rouault and PROJ contributors, 2019-2024, and
+subject to the MIT license.
diff --git a/schemas/v0.1/projjson.schema.json b/schemas/v0.1/projjson.schema.json
index 60fca6dffd..bf1b505697 100644
--- a/schemas/v0.1/projjson.schema.json
+++ b/schemas/v0.1/projjson.schema.json
@@ -2,7 +2,7 @@
   "$id": "https://proj.org/schemas/v0.1/projjson.schema.json",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Schema for PROJJSON",
-  "$comment": "This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_CURRENT_VERSION accordingly in io.cpp",
+  "$comment": "This document is copyright Even Rouault and PROJ contributors, 2019, and subject to the MIT license. This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_CURRENT_VERSION accordingly in io.cpp",
 
   "oneOf": [
     { "$ref": "#/definitions/crs" },
diff --git a/schemas/v0.2/projjson.schema.json b/schemas/v0.2/projjson.schema.json
index bdb97bd5c4..2b4cfe3eeb 100644
--- a/schemas/v0.2/projjson.schema.json
+++ b/schemas/v0.2/projjson.schema.json
@@ -2,7 +2,7 @@
   "$id": "https://proj.org/schemas/v0.2/projjson.schema.json",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Schema for PROJJSON (v0.2.1)",
-  "$comment": "This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_CURRENT_VERSION accordingly in io.cpp",
+  "$comment": "This document is copyright Even Rouault and PROJ contributors, 2019-2020, and subject to the MIT license. This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_CURRENT_VERSION accordingly in io.cpp",
 
   "oneOf": [
     { "$ref": "#/definitions/crs" },
diff --git a/schemas/v0.3/projjson.schema.json b/schemas/v0.3/projjson.schema.json
index c347b3e1d5..3bd68248f3 100644
--- a/schemas/v0.3/projjson.schema.json
+++ b/schemas/v0.3/projjson.schema.json
@@ -2,7 +2,7 @@
   "$id": "https://proj.org/schemas/v0.3/projjson.schema.json",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Schema for PROJJSON (v0.3)",
-  "$comment": "This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_CURRENT_VERSION accordingly in io.cpp",
+  "$comment": "This document is copyright Even Rouault and PROJ contributors, 2019-2021, and subject to the MIT license. This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_CURRENT_VERSION accordingly in io.cpp",
 
   "oneOf": [
     { "$ref": "#/definitions/crs" },
diff --git a/schemas/v0.4/projjson.schema.json b/schemas/v0.4/projjson.schema.json
index 6ed97b7bc8..9746abade8 100644
--- a/schemas/v0.4/projjson.schema.json
+++ b/schemas/v0.4/projjson.schema.json
@@ -2,7 +2,7 @@
   "$id": "https://proj.org/schemas/v0.4/projjson.schema.json",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Schema for PROJJSON (v0.4)",
-  "$comment": "This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_CURRENT_VERSION accordingly in io.cpp",
+  "$comment": "This document is copyright Even Rouault and PROJ contributors, 2019-2021, and subject to the MIT license. This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_CURRENT_VERSION accordingly in io.cpp",
 
   "oneOf": [
     { "$ref": "#/definitions/crs" },
diff --git a/schemas/v0.5/projjson.schema.json b/schemas/v0.5/projjson.schema.json
index a9af7144a6..2c08f4a994 100644
--- a/schemas/v0.5/projjson.schema.json
+++ b/schemas/v0.5/projjson.schema.json
@@ -2,7 +2,7 @@
   "$id": "https://proj.org/schemas/v0.5/projjson.schema.json",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Schema for PROJJSON (v0.5)",
-  "$comment": "This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_DEFAULT_VERSION accordingly in io.cpp",
+  "$comment": "This document is copyright Even Rouault and PROJ contributors, 2019-2022, and subject to the MIT license. This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_DEFAULT_VERSION accordingly in io.cpp",
 
   "oneOf": [
     { "$ref": "#/definitions/crs" },
diff --git a/schemas/v0.6/projjson.schema.json b/schemas/v0.6/projjson.schema.json
index 6dceb2b2ac..0a97d0827e 100644
--- a/schemas/v0.6/projjson.schema.json
+++ b/schemas/v0.6/projjson.schema.json
@@ -2,7 +2,7 @@
   "$id": "https://proj.org/schemas/v0.6/projjson.schema.json",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Schema for PROJJSON (v0.6)",
-  "$comment": "This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_DEFAULT_VERSION accordingly in io.cpp",
+  "$comment": "This document is copyright Even Rouault and PROJ contributors, 2019-2022, and subject to the MIT license. This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_DEFAULT_VERSION accordingly in io.cpp",
 
   "oneOf": [
     { "$ref": "#/definitions/crs" },
diff --git a/schemas/v0.7/projjson.schema.json b/schemas/v0.7/projjson.schema.json
index b2884953dc..a8578c81e9 100644
--- a/schemas/v0.7/projjson.schema.json
+++ b/schemas/v0.7/projjson.schema.json
@@ -2,7 +2,7 @@
   "$id": "https://proj.org/schemas/v0.7/projjson.schema.json",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "description": "Schema for PROJJSON (v0.7)",
-  "$comment": "This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_DEFAULT_VERSION accordingly in io.cpp",
+  "$comment": "This document is copyright Even Rouault and PROJ contributors, 2019-2023, and subject to the MIT license. This file exists both in data/ and in schemas/vXXX/. Keep both in sync. And if changing the value of $id, change PROJJSON_DEFAULT_VERSION accordingly in io.cpp",
 
   "oneOf": [
     { "$ref": "#/definitions/crs" },