Hi guys,
is it possible to make generated keys for my app , so i can sell the app without being distributed for free by others,
for example kaspersky with activation keys (codes)
thanks
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Hi,
to do so one technical option is to generate an unique ID for the device (Taifun have a free extension for doing this), than connect to an authentication server with API (easy to do Linux+PHP) to calculate a token (hash w/salt).
Store this token in a tinyDB on the device and proceed each launch to local check between device ID and stored hash (use Cryptography module to do so, again hash w/salt).
If someone spread your .apk, the authentication key will be different for other devices and the application unusable.
By the way you can add a timestamp to this mechanism, in order to stop application after some date.
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In my opinion, that would be an inconvenience if the genuine user with a license to use, loses or changes the equipment.
yes it’s true.
However if you replace the UniqueDeviceID by a standard license number, this credentials can be spreed.
Some alternative is to use the phone number as credential and a SMS reception as trigger. Not safe because sim/e-sim can be moved to different devices.
It’s also possible to ask at launch an username and use this as a credential to decypher part of the code. At least if some leak happens you will have the name of the source 
More heavy (and expensive) solution is to ask regularly an authentication token to an authentication server (like SSO are doing) ; if you permit access to a credential all others will be rejected until delog, meaning only one user at the same time for the same ‘license’. It can be counter-productive if the authentication server is done… no one will be able to log (except in case of graceful degradation).