diff --git a/test/private-api/fixtures/test.png b/test/private-api/fixtures/test.png
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diff --git a/test/private-api/fixtures/test.png.license b/test/private-api/fixtures/test.png.license
new file mode 100644
index 000000000..078e5a9ac
--- /dev/null
+++ b/test/private-api/fixtures/test.png.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+
+SPDX-License-Identifier: CC0-1.0
diff --git a/test/private-api/fixtures/test.zip b/test/private-api/fixtures/test.zip
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diff --git a/test/private-api/fixtures/test.zip.license b/test/private-api/fixtures/test.zip.license
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index 000000000..078e5a9ac
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+++ b/test/private-api/fixtures/test.zip.license
@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+
+SPDX-License-Identifier: CC0-1.0