Applicable taxes/duties on import of software license electronically to sell further to customer.

I have a query regarding import of Software through Internet (electronically) from USA to sell further to my customer in India. Will provide our Customer a link to Download the software whereas USA company will send password to them directly, so that they can complete the download through internet. Is there any import/custom duty is applicable on download of electronic licenses to sell further to end customer? - If yes (I am sure that no custom duty is envoled in this case), what will be the rate of duty effecting July 1, 2017 under the scenariod of GST? - Is there any reverse tax/charge mechnism on software license import for end customer? - What will be the rate of GST on software, when I bill to customer in other state? - What is the existing rate of TDS which I have to deduct while making payment to US company if they provide me their TRC certificate.