Re: [Trisquel-users] Dual License?

[adrian . malacoda]

Dual license can mean different things depending on the circumstance. In this  
case (FBReader) it looks like they offer the GPL version to the public, with  
the option to buy a proprietary license that does not have the rules of the  
GPL attached to it. This is of interest only if you're a proprietary software  
developer, which you probably are not. There's plenty of projects that offer  
paid proprietary licenses, such as Qt. The version available to you is a  
GPLed version.

Another meaning of dual license simply means that the source is made publicly  
available under two licenses, and you are allowed to choose one to abide by.  
Mozilla software is often licensed under three licenses (GPL, LGPL, and MPL).  
jQuery and jQuery plugins tend to be dual licensed under the GPL and the MIT  
licenses, although I'm unclear what purpose that serves (as the MIT license  
is fully compatible with the GPL by default).