diff --git a/poky/scripts/contrib/bb-perf/bb-matrix-plot.sh b/poky/scripts/contrib/bb-perf/bb-matrix-plot.sh
index 136a255..e7bd129 100755
--- a/poky/scripts/contrib/bb-perf/bb-matrix-plot.sh
+++ b/poky/scripts/contrib/bb-perf/bb-matrix-plot.sh
@@ -1,21 +1,8 @@
 #!/bin/bash
 #
 # Copyright (c) 2011, Intel Corporation.
-# All rights reserved.
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # DESCRIPTION
 # This script operates on the .dat file generated by bb-matrix.sh. It tolerates
diff --git a/poky/scripts/contrib/bb-perf/bb-matrix.sh b/poky/scripts/contrib/bb-perf/bb-matrix.sh
index 1064565..b1fff0f 100755
--- a/poky/scripts/contrib/bb-perf/bb-matrix.sh
+++ b/poky/scripts/contrib/bb-perf/bb-matrix.sh
@@ -1,21 +1,8 @@
 #!/bin/bash
 #
 # Copyright (c) 2011, Intel Corporation.
-# All rights reserved.
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # DESCRIPTION
 # This script runs BB_CMD (typically building core-image-sato) for all
diff --git a/poky/scripts/contrib/bb-perf/buildstats-plot.sh b/poky/scripts/contrib/bb-perf/buildstats-plot.sh
index 7e8ae04..898834e 100755
--- a/poky/scripts/contrib/bb-perf/buildstats-plot.sh
+++ b/poky/scripts/contrib/bb-perf/buildstats-plot.sh
@@ -1,21 +1,8 @@
 #!/usr/bin/env bash
 #
 # Copyright (c) 2011, Intel Corporation.
-# All rights reserved.
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # DESCRIPTION
 #
diff --git a/poky/scripts/contrib/bb-perf/buildstats.sh b/poky/scripts/contrib/bb-perf/buildstats.sh
index 8d7e248..e9ec2d4 100755
--- a/poky/scripts/contrib/bb-perf/buildstats.sh
+++ b/poky/scripts/contrib/bb-perf/buildstats.sh
@@ -1,21 +1,8 @@
 #!/bin/bash
 #
 # Copyright (c) 2011, Intel Corporation.
-# All rights reserved.
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # DESCRIPTION
 # Given 'buildstats' data (generate by bitbake when setting