There's a 55-page thread about this already here:
http://www.defence.pk/forums/pakist...r-submarine-development-news-discussions.html
It is riddled with Indian trolls insisting the very same thing as yourself. I won't take your bait and derail this thread by responding to your childish taunt.
Better still, YOU find me the papers and patents in those very sites that show that Pakistan has nuclear weapons in the first place. After all, if it isn't on Google Patents / Google Scholar, it couldn't possibly exist, right?
Nuclear weapons aren't a new design, (they are childs play compared to modern scientific goals) and aren't being commercially sold (hopefully).
Any research done for commercial purposes has to be either patented or the research papers will have to be peer-reviewed and thus available on both those websites.
Don't draw a parallel where there is none.
PS: Note just about all other nuclear programs have a lot of their unique processes patented and/or numerous research papers sent through to academic journals for peer review.