关于GNU的GPL的困惑

我最近想采用某个使用了GPL的软件来构建公司的产品,这个产品当然是要出售的,而且不会同时提供source给客户.
我感到的困惑的是,使用这个遵循了GPL的软件后,是否需要接受GPL的限制?因为我只是使用,而没有修改.

以下是我考虑使用的软件
ICE(http://www.zeroc.com)
下面是他的licenses.

Ice is released as open source under the GNU General Public License (GPL). By linking with Ice (directly or indirectly, statically or dynamically, at compile time or runtime), your application is subject to the terms of the GPL, which require that you release the source code of your application if and when you "distribute" it. Distributing an application includes giving it to customers, contractors, parent companies, subsidiaries, or any legal entity other than your own. Also note that the GPL does not permit you to distribute your application if it depends on non-free software (other than common operating system components), meaning that you can only distribute your application if all of its dependencies also have a license that is compatible with the GPL. Please read the GPL FAQ for more information.

If you do not wish to be bound by the terms of the GPL, you can acquire a commercial license from ZeroC. We are flexible with respect to licensing, and will always try to find a licensing model that both works for our customers and gives us a fair share for our Ice software.

One of our licensing models is a license fee that is based on your organization's overall gross annual revenue of all products that use Ice. Of course, this model is only appropriate for Ice software products that are not bundled with other software or with hardware. We therefore also offer other models, including per-CPU licensing fees, fixed annual fees, and one-time buy-outs. Please contact us to discuss your licensing requirements.


这个license好像另外还有针对商业应用的,要收钱,应该是针对我所说的情况吧,
能不能不用收费呢

是受限制地。要把你的产品的源码也公开。

如果从法律角度讲，你要么发布产品源码，要么使用商业版本的许可。如果你们是做产品的话，最好还是购买商业许可吧，因为买了之后还有技术支持。

那是不是如果不打算公开,就应该去购买他的商业许可证.
看来GPL在自由的外衣下,隐藏着金钱的诱惑.

人家也要吃饭生活啊。
开源已经成为一种商业模式了。

……
这个跟GPL有什么关系阿，那是ICE自己的商业许可，又不是GPL的。

我一次在IRC聊天的时候MySQL的一个人说如果你只是使用MySQL,不管是用于免费还是商业目的, 都可以使用GPL而不要求一定开源. 如果你要出售或者发行包含MySQL的产品, 那么除非你的产品也是开源的,否则就要买MySQL的商用license.

你拿别人的劳动成果去赚钱。别人当然要想了，要么你也开放源代码，要么你就付钱，要不然你拿我的东西作出东西赚我的钱，我多亏啊。

也很正常啊。