We are a team of designers and developers with expertise and experience in Photoshop, HTML, CSS, PHP, AJAX, JQuery, Angular JS, XML, Wordpress, Bootstrap, CodeIgniter, Laravel, Google Map API and MySql.
We have designed and coded many custom sites and applications of varied extents and complexity.
I have read your requirement - we have developed something similar for one of our desktop applications.
"user can use the app" - do we have to do something about this? Once key is validated, where do we take the user? Once a key is used by a user, that user is free to use the app any number of times? The same key is not valid for another user?
"after success user can use the apps. and when they open it next time the activation interface will not needed...play the apps directly" - as user is not logging in, how do we enable identifying a returning user?
Please address the above - this will help me to assess scope of work precisely. I will revise / confirm my bid accordingly. Detailed specifications and inputs will also help me to make an informed commitment and deliver as required.
I ensure a very thorough job and also support if you need changes / enhancements in future. I look forward to hearing from you and working on the project.