You can protect an app by protecting the Usert interface by copyright. The concept by patent, if eligible, and the code by copyright. Additionally, if you use a brand on your website, the brand may be protected by Trademark Registration, if it is eligible.
Your relationship with the gentleman in Pakistan is determined by your contractual/business relationship.
Please le me know if you have any questions.
Best regards,
Alan M. Sack
SACK IP Law p.c.
Alan.Sack@SACK-IP.com
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