If I buy Draft Sight pro with $ 99, what happens after 1 year?
I assume it to be the same in other countries (although i could be wrong) but in the UK you can either purchase Draftsight Pro with a 'one off purchase' or you can purchase a subscription license. If you purchase the one off then the software is yours to use for as long as you want and you have the chance to upgrade to any new versions within the first 12 months ONLY, whereas if you purchase the subscription license you would have 12 months of USE along with any upgrades but would be required to pay the renewel fee every 12 months to get the next 12 months of use of the software. The benefit of the subscription purchase is that you can upgrade to new versions all the time.
In answer to your question, I imagine you would be required to pay a renewal payment if you wanted to continue to use Draftsight
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