The idea is sell the program, and who wants can buy the source, too, at an additional price.
You can sell the program, but you can't treat the source as a separate optional package that's given only at an additional price.
Update:
On the other hand, if you wrote the program, (as in, you're the copyright holder), then you can sell the source separately under the terms of the LGPL license.
Just bear in mind that whoever receives it will be able to re-distribute it how ever he wants without ever having to consult you.
Question: If I release a program under the LGPL, can I charge for the sourcecode?
yes. it's just that everybody that has a copy of the source under the terms of the LGPL is free to re-distribute that source code to others too, either with or without charging for it. And of course, the LGPL would grant them other freedoms too, such as the freedom to modify the code, copy it, etc.
Read the license.
EDIT: as is pointed out in the comments, you can sell the program under LGPL (which automatically implies giving the source code too) but not for an addititonal charge.
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评论（3）
您可以出售该程序，但不能将源代码视为仅以额外价格提供的单独可选包。
更新：
另一方面，如果您编写了该程序（例如，您是版权所有者），那么您可以根据以下条款单独出售源代码LGPL 许可证。
请记住，无论谁收到它，都可以按照他想要的方式重新分发它，而无需咨询您。
You can sell the program, but you can't treat the source as a separate optional package that's given only at an additional price.
Update:
On the other hand, if you wrote the program, (as in, you're the copyright holder), then you can sell the source separately under the terms of the LGPL license.
Just bear in mind that whoever receives it will be able to re-distribute it how ever he wants without ever having to consult you.
如果您根据 GPL（或 LGPL）发布，则您向其提供程序的任何人都必须能够获得源代码的副本。
他们还有权将您的程序和源代码重新分发给他们想要的任何人。
If you release under the GPL (or LGPL), anyone you supply your program to must be able to get a copy of the source.
And they also have the right to redistribute your program and source code to anyone they want to as well.
是的。只是根据 LGPL 条款拥有源代码副本的每个人都可以自由地将源代码重新分发给其他人，无论是否收费。当然，LGPL 也会授予他们其他自由，例如修改代码、复制代码的自由等。
阅读许可证。
编辑：正如评论中所指出的，您可以在 LGPL 下出售该程序（这自动意味着也提供源代码），但不收取额外费用。
yes. it's just that everybody that has a copy of the source under the terms of the LGPL is free to re-distribute that source code to others too, either with or without charging for it. And of course, the LGPL would grant them other freedoms too, such as the freedom to modify the code, copy it, etc.
Read the license.
EDIT: as is pointed out in the comments, you can sell the program under LGPL (which automatically implies giving the source code too) but not for an addititonal charge.