OSPI is plugin API and SDK, that is Copyright (C)2003 by George Yohng You cannot distribute copy of this SDK - if you need other party to have this SDK, you should make that party obtain OSPI SDK from original OSPI site. You can make plugins with this SDK and distribute them in whatever way you want, but IN BINARY FORM ONLY (dll files) - you may also sell plugins. There is file ospitray.exe that you can include in your projects, provided that you do not modify it. Plugins written by you should contain explicit OSPI copyright in about box, readme and documentation, so that user would not miss seeing it. Neither George Yohng, nor 4Front Technologies will be liable for any possible harm coming out of OSPI API/SDK usage. License is only valid until next license version is issued. License and explanation references are available under these URLs: http://www.yohng.com/ospi/ospilicense.txt http://www.yohng.com/ospi/ospiexplain.txt This explanation text is just to save your time, but please, consider reading license agreement itself, as this explanation is not an agreement.