Дмитрий Разваров wrote:
On top of debian will run commercial software that implements business logic. Can you please tell me if there are any legal restrictions on the use of Debian in such a product?
Debian can be redistributed for a fee (which is what I take you mean by "commercial software") and it's up to you to comply with the license for each program you distribute.
Debian GNU/Linux main repository software is (as far as I know) all free software and presents no issue to you distributing copies for a fee (commercial redistribution). You probably want to make sure that nothing you say or distribute conveys the idea that Debian endorses your project and that you provide support for your project's distribution (which is what your users are really paying for). Your users are free to ask Debian users for help whether or not they buy your distribution.
Can the gnu gpl license be extended to our software in this case and can anyone demand the disclosure of the codebase?I don't know what you mean by "extend" the GNU GPL but every version of the GNU GPL already allows for distributing copies of covered software for a fee so long as you comply with the license. So it's not clear to me that you need to alter the GNU GPL in any way to accomplish your goal of distributing a ready-to-use system built from Debian main + other free software.
Recipients of the GPL-covered can request complete corresponding source code and build instructions per their right under the GNU GPL. You can satisfy your obligation under the GNU GPL by distributing complete corresponding source code and build instructions when you distribute the executable binaries instead of a written offer. See https://www.gnu.org/licenses/gpl-faq.html#WhatDoesWrittenOfferValid for more on this written offer.
That way you've done your part and anyone who distributes the GNU GPL-covered software further can satisfy requests for complete corresponding source code and build instructions straight away or they can come up with their own written promise to satisfy later.