HTMLDOC is distributed in both source code and binary (executable) forms. The source code is provided under the terms of the GNU General Public License ("GPL") with a license exception for the OpenSSL toolkit. A copy of the source code license can be found in the file COPYING.txt in the source code distribution.
The binaries are provided under a typical commercial software end-user license agreement which is more restrictive than the GNU GPL.
For those not familiar with the GNU GPL, the license basically allows you to:
What this license does not allow you to do is make changes or add features to HTMLDOC and then sell a binary distribution without source code. You must provide source for any changes or additions to the software, and all code must be provided under the GPL.
Easy Software Products has trademarked the HTMLDOC name. You may use the name in any direct port or binary distribution of HTMLDOC. Please contact Easy Software Products for written permission to use the name in derivative products. Our intention is to protect the value of this trademark and ensure that any derivative product meets the same high-quality standards as the original.
Easy Software Products also sells rights to the HTMLDOC source code under a binary distribution license for vendors that are unable to release source code for their additions and modifications to HTMLDOC under the GNU GPL. For information please contact us at the address shown above.
Easy Software Products sells commercial HTMLDOC binaries and support. You can find out more at the HTMLDOC commercial home page:
http://www.easysw.com/htmldoc/