That is not what "beg the question" means. Begging the question refers to a form of argument in which the final conclusion was earlier presented as a given. That is, a circular argument.
I restated the question, to highlight the absurdity of it. That is not begging the question.
steve19: 'legally you cannot export blueprints about weapons without an export license'
glenra: 'how did this manage to survive first amendment challenges?'
nness: 'how would this be a first amendment issue?'
in nness's comment, i am assuming 'this' is 'exporting blueprints about weapons without an export license'
in other words: 'how would exporting blueprints about weapons without an export license be a first amendment issue?'
you restated this as: 'how is censorship of speech a violation of freedom of speech?' first amendment issue very easily transforms to freedom of speech, but 'exporting blueprints about weapons' does not easily transform to 'censorship of speech'
nness question is essentially 'how does exporting weapon blueprints relate to freedom of speech?' it is not an absurd question.
you responded by equating 'exporting weapon blueprints' with 'censoring speech' with no argument, presupposing the conclusion from the question. ergo, begging the question.