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issue about license type

hello . i need help from vuforia team .

i need to create an ar app to a company for promotion branding by their selling team ( not for commercial puplish ) .

and i evaluate several sdk platforms to choose one in my application .

i know vuforia will and it is good for me . but i need to know some issues before deciding to choose it .

1- i do not know my situation included in which type of pricing plan .

2- for a point of company revenue not exceed 10 millions per year , how can i know this point for my customer's company .

3- for basic plan as you mentioned that cost is 503 $ per year and i should renew it again after one year . is it true ?

can I use basic plan for my issue ?

4- who should buy the license ? me or my customer's company ?  

5- if i need to choose one time purchase key , what should i do ?

6- can I upgrade my application and update target image with database device in basic plan ?

waiting your response .......