modification to android source code, for security, stability and more features

Project Description: I designed my app in one of the cloud based tool. Now the code is ready. I want more coding or modification of code to meet following requirements Of course the freelancer who is awarded the project can start from scratch if he feel comfortable: 1- Make the app to require activation code after trail [login to view URL] could to be authenticate with my server (API to be written by developer). Code to be put on server. 2- Encryption of contents of /assets/Docs folder (Cryptography), so that if someone get hand on my app and extract it, he/she should not be able to use my files for building his own. The format of the contents are HTML, 3- Add Search Function. When Menu Button (of the device) is tapped, a button to appear among other buttons and its functionality to open a page with search box. User type a word or short phrase to look up it through the contents of the app. Found word/s to be listed below search box. User tab one of them then he/she is taken to respective page. Of course, along with the found word, one line of the respective sentence to be displayed below the search box. (for further explanation, I am read to accommodate your skype address). 4- Fixing the problem of some errors To be noted, no milestones will be released until delivery of work, milestone will be accepted. end