The SharpDevelop debugger consists of two parts: the Debugger.Core library and the Debugger.AddIn.

The Debugger.Core library is high level library for debugging of .NET applications.  It is released under the LGPL license and it is intended to be used in other applications (including closed-source ones).

Debugger.AddIn is the glue that connects the Debugger.Core library and SharpDevelop.  It implements the debugging GUI including the main menu commands.  As such it is a great example on how to use the debugger library and therefore we have licensed it under the BSD license so that it can be reused by anyone intending to use the debugger in closed-source application.

Note that this applies only to the Montferrer 3.0 branch (ie the trunk).  The 2.x version of the debugger is intended to be deprecated as soon as the 3.0 version is stable.