Application code shared between GNU and Comercial software
<p>We have a software of our authory and made by our company, We have licensed a sub part of it as GPL v2 and still develloping a professional version with more features and that shares the code we publishes as GPL in a comercial license .</p>

<p>Now they are saying that I´can´t comercialize our product becouse its a derivation of a GPL software.</p>

<p>It doesnt use any code of the community or any other GPL library, only code writen by our company and some comercial (we have licenses), LGPL and MIT licensed librarys.</p>

<p>I would like to know yours opnion about the fact so I can do the right thing.</p>

<p>Thanks in advanced</p>

<p>If you use some GPL licensed software in violation of the license, the copyright holder can sue you for copyright infringement. The copyright holder. Nobody else. Nobody else can sue you for copyright violation or anything else. </p>

<p>As it seems that your company is the sole copyright holder, nobody can sue you but yourself. And as long as you don't sue yourself, you're just fine. (And as Dale says quite correctly, suing yourself wouldn't be just stupid, it could also be quite difficult or impossible).</p>

<p>PS Suggesting features or finding bugs doesn't create a copyright. It could be argued that even fixing bugs doesn't create copyright.</p>

<p>PS The license is completely irrelevant to this. The only thing that the GPL license does is saying who commits copyright infringement if they use the code, and who doesn't. As the sole copyright holder you cannot possibly infringe on your own copyright. And whoever is threatening you, as non-copyright holder they have no standing to sue you and will be laughed out of court. Even if I did illegally copy your software, that person who is not the copyright holder would have no standing to sue me, only you as the copyright holder would. So the case is double ridiculous: They have no standing to sue, and you have the copyright and would win even if they had standing. </p>

<p>I'll just repeat that: Anyone who isn't the copyright holder will be laughed out of court if they sue you. The judge won't even look at the license. The judge will ask them: Are you the copyright holder? If they answer "No" or "No, but..." the judge sends them packing. </p>

<p>If someone <em>threatens</em> to sue you, tell them to sue you, and laugh at them. If someone sues you, get a lawyer, and the lawyer will laugh at them. </p>

copyright licensing authorship