You can license JHotDraw 7 under the Lesser GNU Public License (LGPL) or under the Creative Commons Attribution (by) 3.0 license.

JHotDraw 7
Copyright © 1996-2008 by the original authors of JHotDraw
and all its contributors ("JHotDraw.org")
All rights reserved.

JHotDraw 7 was developed by:

• Werner Randelshofer, Staldenmattweg 2, CH-6405 Immensee, Switzerland
  werner.randelshofer@bluewin.ch

JHotDraw 7 is a major rewrite of JHotDraw versions 1 through 6:

• JHotDraw versions 1 through 6
  The original version of JHotDraw is copyright 1996, 1997 by IFA Informatik and Erich Gamma.
  JHotDraw versions 1 through 6 are licensed under the Lesser GNU Public License (LGPL).

JHotDraw 7 incorporates derived versions of NanoXML and NanoXML Lite.

• NanoXML and NanoXML Lite
  Copyright © 2000-2002 Marc De Scheemaecker,
  All Rights Reserved.
  
  This software is provided 'as-is', without any express or implied warranty. In no event will the author be held liable for any damages arising from the use of this software.
  Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
  The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
  Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
  This notice may not be removed or altered from any source distribution.

The SVG example in JHotDraw 7 incorporates some derived classes from the Apache Batik SVG Toolkit. These classes are not needed for the use of the framework.

• Apache Batik SVG Toolkit
  Copyright 2001-2003 The Apache Software Foundation
  Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

The following unaltered software libraries are used by JHotDraw 7:

• Quaqua Look and Feel
  Copyright © 2003–2006 Werner Randelshofer
  All Rights Reserved.
  The Quaqua Look and Feel is licensed under the Lesser GNU Public License (LGPL).
• MRJAdapter
  Copyright © 2002–2006 Steve Roy
  All Rights Reserved.
  MRJAdapter is licensed under the Artistic License.