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GPLv2 Libraries — Is There a Point?
PiSkyHi writes "I understand that if I build an application that links with a library that is licensed under GPLv2, I must also make my application GPL2. I can see that value in this for an application. But for a library, what's to stop me separating my program into a GPLv2-compliant client app that talks to the rest of my (choose my own license) application?"
what's to stop me separating my program into a GPLv2-compliant client app that talks to the rest of my (choose my own license) application?
Umm... nothing?
If you're writing your application from scratch without using anybody else's libraries, you're free to release it under whatever license you like, even if it happens to talk to a GPL'd client plugin thingie, and even if you wrote that GPL'd client plugin thingie around somebody else's GPL'd library.
Why do you imagine that somehow there's a problem here?
$x='S24;r)>63/* h@<5+oZ)32"5cz';$me='phroggy'x$];
$x=~y+ -xz+\0-Tx+;print$_^chop$me for split'',$x;
The point is that enhancements to the library stay LGPL. I did this myself. I needed to modify LGPL libraries for the purposes of my application. I modified the libraries, and I am redistributing them under the LGPL. My main application is distributed under BSD license, and uses the LGPL libraries. The libraries make perfect sense separately (and in fact, I have people using them for reasons unrelated to the application I built). I think that, out of courtesy, and probably out of need, you need to make sure that the libraries are available separately.
The GPL does not guarantee that someone has to give you anything back. In fact, there is no reciprocation requirement at all.
I can, for example, take your GPL'd work, make some changes, then sell it to my customer. I am required, by the rules of the GPL, to give my customer the source, and they are allowed to do whatever they want, including give it to others, but if they paid $1,000,000 for it, chances are they're not going to do that. You have no right to demand the changes I made, or even a copy of the program from me.
This is a common myth around the GPL, that it enforces a reciprocation agreement. It doesn't. In fact, licenses that have such agreements are not compatible with the GPL.
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