Can you sell a product that uses open source software?
Absolutely. All Open Source software can be used for commercial purpose; the Open Source Definition guarantees this. You can even sell Open Source software. However, note that commercial is not the same as proprietary.
What is open source software legal?
In general, that means nobody else can use, copy, distribute, or modify your work without being at risk of take-downs, shake-downs, or litigation. Open source is an unusual circumstance, however, because the author expects that others will use, modify, and share the work.
Can I change the GPL license of software I have given?
Assume that all the code was written by only one person, they received no contributions. There’s no way you can rescind the GPL on the software you have already given someone. The only way that license is allowed to be changed is to a newer version of the GPL.
Is it possible to change the license of a software?
The only way that license is allowed to be changed is to a newer version of the GPL. Whoever received it as GPL will always be free to use it and redistribute it to others under the GPL. However, if you hold the copyright on the software, you can do whatever you want with it yourself.
Does the GPL require that projects using GPL code to be released?
“requiring that any original works . . . to also be released as free/open code under the GPL” – This may be a distinction without a difference in your case, but that is notwhat the GPL requires. It does not say that projects using GPL code must be released to the public.
Is it possible to rescind a GPL license?
There’s no way you can rescind the GPL on the software you have already given someone. The only way that license is allowed to be changed is to a newer version of the GPL. Whoever received it as GPL will always be free to use it and redistribute it to others under the GPL.