diff --git a/cybertools/text/doc.py b/cybertools/text/doc.py
index f29610b..d2bd619 100644
--- a/cybertools/text/doc.py
+++ b/cybertools/text/doc.py
@@ -1,29 +1,9 @@
-#
-#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.doc
 
-"""
-Searchable text support for MS Word (.doc) files.
+"""Searchable text support for MS Word (.doc) files.
 
 This uses the wvware command to perform the extraction.
-
 Based on code provided by zc.index and TextIndexNG3.
-
-$Id$
 """
 
 import os, sys
diff --git a/cybertools/text/html.py b/cybertools/text/html.py
index 1338681..3e4bdcd 100644
--- a/cybertools/text/html.py
+++ b/cybertools/text/html.py
@@ -1,25 +1,6 @@
-#
-#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.html
 
-"""
-Searchable text support for HTML files.
-
-$Id$
+"""Searchable text support for HTML files.
 """
 
 import os, sys
diff --git a/cybertools/text/interfaces.py b/cybertools/text/interfaces.py
index c74d6ff..14e737e 100644
--- a/cybertools/text/interfaces.py
+++ b/cybertools/text/interfaces.py
@@ -1,25 +1,6 @@
-#
-#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.interfaces
 
-"""
-interface definitions for text transformations.
-
-$Id$
+"""interface definitions for text transformations.
 """
 
 from zope.interface import Interface
diff --git a/cybertools/text/mimetypes.py b/cybertools/text/mimetypes.py
index 977415b..1f5ed30 100644
--- a/cybertools/text/mimetypes.py
+++ b/cybertools/text/mimetypes.py
@@ -1,25 +1,6 @@
-#
-#  Copyright (c) 2011 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.mimetypes
 
-"""
-Some mime types rules, redefined here for more specific assignments.
-
-$Id$
+"""Some mime types rules, redefined here for more specific assignments.
 """
 
 extensions = {
diff --git a/cybertools/text/ooffice.py b/cybertools/text/ooffice.py
index a1b7228..810ab96 100644
--- a/cybertools/text/ooffice.py
+++ b/cybertools/text/ooffice.py
@@ -1,27 +1,8 @@
-#
-#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.ooffice
 
-"""
-Searchable text support for OpenOffice files.
+"""Searchable text support for OpenOffice files.
 
 Based on code provided by zc.index and TextIndexNG3.
-
-$Id$
 """
 
 import os, sys
diff --git a/cybertools/text/pdf.py b/cybertools/text/pdf.py
index 55b9271..1ac20d8 100644
--- a/cybertools/text/pdf.py
+++ b/cybertools/text/pdf.py
@@ -1,29 +1,9 @@
-#
-#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.pdf
 
-"""
-Searchable text support for Portable Document Format (PDF) files.
+"""Searchable text support for Portable Document Format (PDF) files.
 
 This uses the pdftotext command from xpdf to perform the extraction.
-
 Based on code provided by zc.index and TextIndexNG3.
-
-$Id$
 """
 
 import os, sys
diff --git a/cybertools/text/ppt.py b/cybertools/text/ppt.py
index b45f9eb..1170541 100644
--- a/cybertools/text/ppt.py
+++ b/cybertools/text/ppt.py
@@ -1,30 +1,10 @@
-#
-#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.ppt
 
-"""
-Searchable text support for Portable Document Format (PDF) files.
-
-This uses the pdftotext command from xpdf to perform the extraction.
-interface definitions for text transformations.
+"""Searchable text support for PowerPoint (.ppt) files.
 
+This uses the ppthtml command from PowerPoint to perform the extraction.
+Note: ppthtml is no longer available on current Debian or Ubuntu versions.
 Based on code provided by zc.index and TextIndexNG3.
-
-$Id$
 """
 
 import os, sys
diff --git a/cybertools/text/rtf.py b/cybertools/text/rtf.py
index 0e46c94..ce057c8 100644
--- a/cybertools/text/rtf.py
+++ b/cybertools/text/rtf.py
@@ -1,29 +1,9 @@
-#
-#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.rtf
 
-"""
-Searchable text support for MS Word (.doc) files.
+"""Searchable text support for MS Word (.doc) files.
 
 This uses the wvware command to perform the extraction.
-
 Based on code provided by zc.index and TextIndexNG3.
-
-$Id$
 """
 
 import os, sys
diff --git a/cybertools/text/tests.py b/cybertools/text/tests.py
index e735450..c11e21e 100755
--- a/cybertools/text/tests.py
+++ b/cybertools/text/tests.py
@@ -10,6 +10,7 @@ from cybertools.text import pdf
 
 warnings.filterwarnings('ignore', category=ResourceWarning)
 
+
 class Test(unittest.TestCase):
     "Basic tests for the text package."
 
diff --git a/cybertools/text/xls.py b/cybertools/text/xls.py
index b3c7ac6..82b2dc3 100644
--- a/cybertools/text/xls.py
+++ b/cybertools/text/xls.py
@@ -1,29 +1,9 @@
-#
-#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
-#
-#  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
-#
+# cybertools.text.xls
 
-"""
-Searchable text support for MS Excel (.xls) files.
+"""Searchable text support for MS Excel (.xls) files.
 
 This uses the xls2csv command to perform the extraction.
-
 Based on code provided by zc.index and TextIndexNG3.
-
-$Id$
 """
 
 import os, sys