iText Java库是免费的，还是需要支付任何费用？ [英] Is iText Java library free of charge or have any fees to be paid?
问题描述
iText Java库是免费生成PDF文档还是我们必须付费？
Are iText Java libraries to generate PDF documents free or do we have to pay for it?
推荐答案
我是原创iText的开发人员和 iText Group 的首席执行官。我也是创始人研究所的导师。请查看我为创始人研究所启动法律和知识产权会议的幻灯片： http://www.slideshare.net/blowagie/startup-legal-and-ip
I am the original developer of iText and the CEO of the iText Group. I'm also a Mentor at the Founder Institute. Please take a look at my slides for the session about Startup Legal and IP for the Founder Institute: http://www.slideshare.net/blowagie/startup-legal-and-ip
iText是软件，因此版权法适用：
iText is software and therefor copyright law applies:
版权法允许作者禁止他人复制，改编或分发作者作品的副本。
Copyright law allows an author to prohibit others from reproducing, adapting, or distributing copies of the author's work.
根据版权法，您无权使用自己未编写的软件。
According to the copyright law, you do not have the right to use software that you didn't write yourself.
然而，iText使用copyleft许可证分发：
However, iText is distributed using a copyleft license:
Copyleft为每个收到工作许可副本的人提供复制，适应只要任何产生的副本或改编也受同一个Copyleft许可方案的约束，就可以分发作品。
Copyleft gives every person who receives a copy of a work permission to reproduce, adapt or distribute the work as long as any resulting copies or adaptations are also bound by the same copyleft licensing scheme.
这意味着任何人都可以免费使用iText，只要符合其使用条件。
This means that anyone can use iText for free as long as the conditions for its use are met.
要了解有关条件的更多信息，您需要查看许可证。在这种情况下：AGPL。这意味着：
To know more about the conditions, you need to take a look at the license. In this case: the AGPL. This means that:
- 如果不分发您自己的应用程序的完整源代码，则无法分发基于iText的封闭源应用程序。
- 如果没有通过该Web应用程序提供Web应用程序的完整源代码，则无法在Web应用程序中使用iText。
这就是为什么人们经常将AGPL称为病毒许可证：触及AGPL库的所有软件（如iText）也需要免费。
This is why people often refer to the AGPL as a viral license: all the software that touches an AGPL library such as iText needs to be free too.
显然，有很多公司不想发布他们的源代码。这就是为什么iText Software还在另一个许可下提供iText的原因。此许可证是商业许可证。您需要付费。
Obviously, there are plenty of companies who do not want to ship their source code. That's why iText Software also provides iText under another license. This license is a commercial license. You have to pay for it.
回答您的问题：在您免费分发软件的情况下，iText可以免费使用。一旦您想在封闭源，专有环境中使用iText，您必须支付使用iText的费用。
To answer your question: iText can be used for free in situations where you also distribute your software for free. As soon as you want to use iText in a closed source, proprietary environment, you have to pay for your use of iText.
请阅读书中的法律部分< a href =http://pages.itextpdf.com/ebook-stackoverflow-questions.html =noreferrer>StackOverflow上最好的iText问题：
Please read the Legal section in the book "The Best iText Questions on StackOverflow":
还有一个 iText网站上的常见问题解答将为您提供更多信息。如果您需要律师的建议，您可以随时观看此视频： https：// www .youtube.com / watch？v = NCwhEWEPV-E （15分钟）。
There's also a FAQ on the iText web site that will give you more info. If you want the advice of a lawyer, you can always watch this video: https://www.youtube.com/watch?v=NCwhEWEPV-E (15 minutes).
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