cryptography - license keys generation method for software product -

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we have software database product delivered customer. fees charged based on number of factors such as

  1. number of users can created
  2. number of database transactions etc

we wanted give license key whenever user pays time duration. license key should contain such information duration of product, number of users/transactions allowed etc..

what cryptographically secure way of license key generation (that contains whole information , can read securely our system @ end) prevent user illegal usage.

i know rsa method how go it? , there tools available should checkout?

you can generate license files public-private key cryptography, , using rsa. please @ library, can found useful. http://afewguyscoding.com/page/2/ library people have done survey, give idea how method works.

there github project using similar approach. visit https://github.com/starschema/slm4j


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