diff --git a/.gitattributes b/.gitattributes
index e25b8c0ab65..f90d8b10aec 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -647,10 +647,12 @@ Maintenance/rpm/rpmbuild -text
 Maintenance/svn_server/hooks/post-commit -text
 Maintenance/svn_server/hooks/post-commit.tmpl -text
 Maintenance/svn_server/hooks/post-lock.tmpl -text
+Maintenance/svn_server/hooks/post-revprop-change -text
 Maintenance/svn_server/hooks/post-revprop-change.tmpl -text
 Maintenance/svn_server/hooks/post-unlock.tmpl -text
 Maintenance/svn_server/hooks/pre-commit.tmpl -text
 Maintenance/svn_server/hooks/pre-lock.tmpl -text
+Maintenance/svn_server/hooks/pre-revprop-change -text
 Maintenance/svn_server/hooks/pre-revprop-change.tmpl -text
 Maintenance/svn_server/hooks/pre-unlock.tmpl -text
 Maintenance/svn_server/hooks/start-commit.tmpl -text
diff --git a/Maintenance/svn_server/hooks/post-revprop-change b/Maintenance/svn_server/hooks/post-revprop-change
new file mode 100755
index 00000000000..079ffb85f24
--- /dev/null
+++ b/Maintenance/svn_server/hooks/post-revprop-change
@@ -0,0 +1,50 @@
+#!/bin/sh
+
+# POST-REVPROP-CHANGE HOOK
+#
+# The post-revprop-change hook is invoked after a revision property
+# has been added, modified or deleted.  Subversion runs this hook by
+# invoking a program (script, executable, binary, etc.) named
+# 'post-revprop-change' (for which this file is a template), with the
+# following ordered arguments:
+#
+#   [1] REPOS-PATH   (the path to this repository)
+#   [2] REV          (the revision that was tweaked)
+#   [3] USER         (the username of the person tweaking the property)
+#   [4] PROPNAME     (the property that was changed)
+#   [5] ACTION       (the property was 'A'dded, 'M'odified, or 'D'eleted)
+#
+#   [STDIN] PROPVAL  ** the old property value is passed via STDIN.
+#
+# Because the propchange has already completed and cannot be undone,
+# the exit code of the hook program is ignored.  The hook program
+# can use the 'svnlook' utility to help it examine the
+# new property value.
+#
+# On a Unix system, the normal procedure is to have 'post-revprop-change'
+# invoke other programs to do the real work, though it may do the
+# work itself too.
+#
+# Note that 'post-revprop-change' must be executable by the user(s) who will
+# invoke it (typically the user httpd runs as), and that user must
+# have filesystem-level permission to access the repository.
+#
+# On a Windows system, you should name the hook program
+# 'post-revprop-change.bat' or 'post-revprop-change.exe',
+# but the basic idea is the same.
+# 
+# The hook program typically does not inherit the environment of
+# its parent process.  For example, a common problem is for the
+# PATH environment variable to not be set to its usual value, so
+# that subprograms fail to launch unless invoked via absolute path.
+# If you're having unexpected problems with a hook program, the
+# culprit may be unusual (or missing) environment variables.
+
+REPOS="$1"
+REV="$2"
+USER="$3"
+PROPNAME="$4"
+ACTION="$5"
+
+/usr/lib/subversion/hook-scripts/propchange-email.pl "$REPOS" "$REV" "$USER" "$PROPNAME" -h users.gforge.inria.fr cgal-commits@lists.gforge.inria.fr
+
diff --git a/Maintenance/svn_server/hooks/post-revprop-change.tmpl b/Maintenance/svn_server/hooks/post-revprop-change.tmpl
index b3b80200448..77640e99d5f 100644
--- a/Maintenance/svn_server/hooks/post-revprop-change.tmpl
+++ b/Maintenance/svn_server/hooks/post-revprop-change.tmpl
@@ -40,7 +40,8 @@
 # If you're having unexpected problems with a hook program, the
 # culprit may be unusual (or missing) environment variables.
 # 
-# Here is an example hook script, for a Unix /bin/sh interpreter.# For more examples and pre-written hooks, see those in
+# Here is an example hook script, for a Unix /bin/sh interpreter.
+# For more examples and pre-written hooks, see those in
 # the Subversion repository at
 # http://svn.collab.net/repos/svn/trunk/tools/hook-scripts/ and
 # http://svn.collab.net/repos/svn/trunk/contrib/hook-scripts/
@@ -53,3 +54,4 @@ PROPNAME="$4"
 ACTION="$5"
 
 /usr/lib/subversion/hook-scripts/propchange-email.pl "$REPOS" "$REV" "$USER" "$PROPNAME" watchers@example.org
+
diff --git a/Maintenance/svn_server/hooks/pre-revprop-change b/Maintenance/svn_server/hooks/pre-revprop-change
new file mode 100755
index 00000000000..4c8b5cbfa68
--- /dev/null
+++ b/Maintenance/svn_server/hooks/pre-revprop-change
@@ -0,0 +1,61 @@
+#!/bin/sh
+
+# PRE-REVPROP-CHANGE HOOK
+#
+# The pre-revprop-change hook is invoked before a revision property
+# is added, modified or deleted.  Subversion runs this hook by invoking
+# a program (script, executable, binary, etc.) named 'pre-revprop-change'
+# (for which this file is a template), with the following ordered
+# arguments:
+#
+#   [1] REPOS-PATH   (the path to this repository)
+#   [2] REVISION     (the revision being tweaked)
+#   [3] USER         (the username of the person tweaking the property)
+#   [4] PROPNAME     (the property being set on the revision)
+#   [5] ACTION       (the property is being 'A'dded, 'M'odified, or 'D'eleted)
+#
+#   [STDIN] PROPVAL  ** the new property value is passed via STDIN.
+#
+# If the hook program exits with success, the propchange happens; but
+# if it exits with failure (non-zero), the propchange doesn't happen.
+# The hook program can use the 'svnlook' utility to examine the
+# existing value of the revision property.
+#
+# WARNING: unlike other hooks, this hook MUST exist for revision
+# properties to be changed.  If the hook does not exist, Subversion
+# will behave as if the hook were present, but failed.  The reason
+# for this is that revision properties are UNVERSIONED, meaning that
+# a successful propchange is destructive;  the old value is gone
+# forever.  We recommend the hook back up the old value somewhere.
+#
+# On a Unix system, the normal procedure is to have 'pre-revprop-change'
+# invoke other programs to do the real work, though it may do the
+# work itself too.
+#
+# Note that 'pre-revprop-change' must be executable by the user(s) who will
+# invoke it (typically the user httpd runs as), and that user must
+# have filesystem-level permission to access the repository.
+#
+# On a Windows system, you should name the hook program
+# 'pre-revprop-change.bat' or 'pre-revprop-change.exe',
+# but the basic idea is the same.
+#
+# The hook program typically does not inherit the environment of
+# its parent process.  For example, a common problem is for the
+# PATH environment variable to not be set to its usual value, so
+# that subprograms fail to launch unless invoked via absolute path.
+# If you're having unexpected problems with a hook program, the
+# culprit may be unusual (or missing) environment variables.
+
+REPOS="$1"
+REV="$2"
+USER="$3"
+PROPNAME="$4"
+ACTION="$5"     # empty on 06/15/2006
+
+if [ "$PROPNAME" = "svn:log" ]; then
+    exit 0;
+else
+    echo "Changing revision properties other than svn:log is prohibited" >&2
+    exit 1
+fi
diff --git a/Maintenance/svn_server/hooks/pre-revprop-change.tmpl b/Maintenance/svn_server/hooks/pre-revprop-change.tmpl
index fda28b94d37..2f2de984892 100644
--- a/Maintenance/svn_server/hooks/pre-revprop-change.tmpl
+++ b/Maintenance/svn_server/hooks/pre-revprop-change.tmpl
@@ -47,7 +47,8 @@
 # If you're having unexpected problems with a hook program, the
 # culprit may be unusual (or missing) environment variables.
 # 
-# Here is an example hook script, for a Unix /bin/sh interpreter.# For more examples and pre-written hooks, see those in
+# Here is an example hook script, for a Unix /bin/sh interpreter.
+# For more examples and pre-written hooks, see those in
 # the Subversion repository at
 # http://svn.collab.net/repos/svn/trunk/tools/hook-scripts/ and
 # http://svn.collab.net/repos/svn/trunk/contrib/hook-scripts/