Licensing of WinSCP screenshots

I would like to take screen shots of WinSCP, and include it in documentation showing an end user how to transfer files. What are the license terms for the WinSCP screen shots. Is it public domain or other open source license?

Thanks,
Dave Gaulke

dgaulke wrote:

I would like to take screen shots of WinSCP, and include it in documentation showing an end user how to transfer files. What are the license terms for the WinSCP screen shots. Is it public domain or other open source license?

GPL.