diff --git a/docs/howto/install-from-packages.rst b/docs/howto/install-from-packages.rst
index 8e98dc32..efb72cb1 100644
--- a/docs/howto/install-from-packages.rst
+++ b/docs/howto/install-from-packages.rst
@@ -233,6 +233,12 @@ normally the build machine, or the cluster nodes when
 :ref:`offloading to a cluster <building-on-a-cluster>`, in which case the build
 machine does not require them.
 
+You also need the following licenses:
+
+1. SMBus IP license. See :ref:`smbus-ip` below for instructions on obtaining the IP and license.
+2. DCMAC IP license. See :ref:`dcmac-license` below for instructions on obtaining the license.
+
+
 Source both before building:
 
 .. code-block:: bash
@@ -252,6 +258,10 @@ binary and exits if it is absent.
    license administrator if you are unsure how licenses are served at your
    site.
 
+   See `Managing Licenses with the Vivado License Manager <https://docs.amd.com/r/en-US/ug973-vivado-release-notes-install-license/Managing-Licenses-with-the-Vivado-License-Manager>`_.
+
+.. _smbus-ip:
+
 SMBus IP
 --------
 
@@ -266,8 +276,9 @@ local IP repository before building:
    ``linker/slashkit/resources/base/common/iprepo/``
    so that Vivado can locate it during synthesis. The directory name must
    begin with ``smbus``; a release-date suffix is permitted.
+3. Generate the SMBus license from the `AMD License Center <https://amd.entitlenow.com/AcrossUser>`_
+   and add it to your Vivado license configuration.
 
-Confirm the result before starting the build:
 
 .. code-block:: bash
 
@@ -279,6 +290,25 @@ performing any work.
 See the `AVED rebuild guide <https://xilinx.github.io/AVED/>`_ for
 additional details.
 
+
+.. _dcmac-license:
+
+DCMAC IP License
+----------------
+
+The `Versal™ Adaptive SoC 600G Channelized Multirate Ethernet Subsystem (DCMAC)
+<https://www.amd.com/en/products/adaptive-socs-and-fpgas/intellectual-property/dcmac.html>`_
+drives the 200 Gb/s network interfaces in the static shell and requires a Vivado
+license to build. The license is free but must be generated and registered before
+building.
+
+1. Open the `DCMAC IP product page <https://www.amd.com/en/products/adaptive-socs-and-fpgas/intellectual-property/dcmac.html>`_
+   and click **Get License**.
+2. Follow the steps to generate the license.
+3. Add the license to your Vivado license configuration.
+
+Confirm the result before starting the build:
+
 .. _build-the-packages:
 
 Build the Packages
diff --git a/docs/howto/use-dcmac.rst b/docs/howto/use-dcmac.rst
index d5fb68e9..6f345bea 100644
--- a/docs/howto/use-dcmac.rst
+++ b/docs/howto/use-dcmac.rst
@@ -19,6 +19,8 @@ Prerequisites
 - A V80 with two QSFP56 cages externally wired to DCMAC0 port 0 (``eth_0``) and
   DCMAC1 port 0 (``eth_2``).
 - Vivado and Vitis HLS **2025.1** or newer, sourced in your shell.
+- A **DCMAC IP license** added to your Vivado license configuration. See
+  :ref:`dcmac-license` in the install guide.
 - Building from a source checkout, the ``Versal-DCMAC`` submodule, which
   supplies the DCMAC block design and its RTL:
 
diff --git a/scripts/package-deb.sh b/scripts/package-deb.sh
index 6cea3e61..79b0baa8 100755
--- a/scripts/package-deb.sh
+++ b/scripts/package-deb.sh
@@ -88,6 +88,31 @@ if [[ -z "${SLASH_PKG_SKIP_ROOT_DESIGN_BUILD:-}" ]]; then
         echo "See docs/howto/install-from-packages.rst for details." >&2
         _prereq_ok=0
     fi
+    _license_report=/tmp/slash-licenses.txt
+    _license_tcl=/tmp/slash-licenses.tcl
+    echo "report_environment -file {${_license_report}} -format text" > "${_license_tcl}"
+    vivado -mode batch -nolog -nojournal -source "${_license_tcl}" 2>/dev/null
+    rm -f "${_license_tcl}"
+
+    if [[ ! -s "${_license_report}" ]]; then
+        echo "ERROR: Vivado failed to generate the license report. Check that Vivado" >&2
+        echo "       starts correctly and the license server is reachable." >&2
+        _prereq_ok=0
+    else
+        if [[ "$(grep -i 'dcmac' "${_license_report}" | grep -c 'IP:Bought')" -eq 0 ]]; then
+            echo "ERROR: DCMAC IP license not found in Vivado license configuration." >&2
+            echo "See docs/howto/install-from-packages.rst for details." >&2
+            _prereq_ok=0
+        fi
+
+        if [[ "$(grep -i 'smbus' "${_license_report}" | grep -c 'IP:Bought')" -eq 0 ]]; then
+            echo "ERROR: SMBus IP license not found in Vivado license configuration." >&2
+            echo "See docs/howto/install-from-packages.rst for details." >&2
+            _prereq_ok=0
+        fi
+    fi
+
+    rm -f "${_license_report}"
 fi
 
 if [[ "${_prereq_ok}" -eq 0 ]]; then