diff --git a/.gitignore b/.gitignore
index 8ae519b..d44f10e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,4 @@ lxml-2.2.7.tar.gz.asc
 /lxml-4.7.1.tar.gz
 /lxml-4.9.1.tar.gz
 /lxml-4.9.2.tar.gz
+/lxml-4.9.2-no-isoschematron.tar.gz
diff --git a/get-lxml-source.sh b/get-lxml-source.sh
new file mode 100755
index 0000000..9d79f3a
--- /dev/null
+++ b/get-lxml-source.sh
@@ -0,0 +1,29 @@
+#! /bin/bash -ex
+
+# Download a release of lxml (if missing) and remove the isoschematron module from it
+
+version=$1
+
+if [ -z "${version}" ]; then
+    echo "Usage: $0 VERSION" >& 2
+    echo "" >& 2
+    echo "example: $0 4.9.2" >& 2
+    exit 1
+fi
+
+versionedname=lxml-${version}
+orig_archive=${versionedname}.tar.gz
+new_archive=${versionedname}-no-isoschematron.tar.gz
+
+if [ ! -e ${orig_archive} ]; then
+    wget -N https://files.pythonhosted.org/packages/source/l/lxml/${orig_archive}
+fi
+
+deleted_module=lxml-${version}/src/lxml/isoschematron/
+deleted_test=lxml-${version}/src/lxml/tests/test_isoschematron.py
+
+# tar --delete does not operate on compressed archives, so do
+# gz decompression explicitly
+gzip --decompress ${orig_archive}
+tar -v --delete -f ${orig_archive//.gz} {$deleted_module,$deleted_test}
+gzip -cf ${orig_archive//.gz} > ${new_archive}
diff --git a/python-lxml.spec b/python-lxml.spec
index 7e618b2..686452b 100644
--- a/python-lxml.spec
+++ b/python-lxml.spec
@@ -1,15 +1,20 @@
 Name:           python-lxml
 Version:        4.9.2
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        XML processing library combining libxml2/libxslt with the ElementTree API
 
 # The lxml project is licensed under BSD-3-Clause
 # Some code is derived from ElementTree and cElementTree
 # thus using the MIT-CMU elementtree license
-# .xsl schematron files are under the MIT license
-License:        BSD-3-Clause AND MIT-CMU AND MIT
+License:        BSD-3-Clause AND MIT-CMU
 URL:            https://github.com/lxml/lxml
-Source:         %{pypi_source lxml}
+
+# We use the get-lxml-source.sh script to generate the tarball
+# without the isoschematron submodule as it contains a problematic
+# license.
+# See: https://gitlab.com/fedora/legal/fedora-license-data/-/issues/154
+Source0:         lxml-%{version}-no-isoschematron.tar.gz
+Source1:         get-lxml-source.sh
 
 # Upstream issue: https://bugs.launchpad.net/lxml/+bug/2016939
 Patch:          Skip-failing-test-test_html_prefix_nsmap.patch
@@ -53,6 +58,11 @@ Python 3 version.
 
 %prep
 %autosetup -n lxml-%{version} -p1
+# Remove isoschematron module due to problematic license
+sed -i "s/, 'lxml.isoschematron'//" setup.py
+# Remove the doctests for it (the documentation is not shipped)
+# The command [d]eletes all lines from the first pattern to the second
+sed -Ei '/^Schematron$/,/^\(Pre-ISO-Schematron\)$/d' doc/validation.txt
 
 %generate_buildrequires
 %pyproject_buildrequires -x source%{?with_extras:,cssselect,html5,htmlsoup}
@@ -78,9 +88,12 @@ cp -a build/lib.%{python3_platform}-*/* src/
 
 %files -n python3-lxml -f %{pyproject_files}
 %license doc/licenses/BSD.txt doc/licenses/elementtree.txt
-%doc README.rst src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/readme.txt
+%doc README.rst
 
 %changelog
+* Wed May 31 2023 Miro Hrončok <mhroncok@redhat.com> - 4.9.2-5
+- Remove the isoschematron submodule
+
 * Tue May 30 2023 Yaakov Selkowitz <yselkowi@redhat.com> - 4.9.2-4
 - Disable extra subpackages in RHEL builds
 
diff --git a/sources b/sources
index ff93acf..2599e86 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (lxml-4.9.2.tar.gz) = 4597784c96219145fef30607f257097ad312264a6796e65b3dc74463853cd29f55379b6a903b401c1120750126b57f58dd9fc459dd453e57030883fc76b87ea3
+SHA512 (lxml-4.9.2-no-isoschematron.tar.gz) = 3ee80967dfa69c840a27ad99546727346f8bb058ed64bf93d2aa8959fb3000e78c1227f4b8709d25aaadeb9a4ccdf97a03eb53a1171de8feda93fbeaa15a8b39