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My application has to download some media files at runtime. I found that I can store them in internal storage so that only my application can access them.
The problem is that internal storage is limited. Now I want to store media files in sdcard but I want to protect them, so that users can not pull them out of the sdcard and distribute them illegally.
you can achieve this only by encrypt your downloading file with some key , so another application can not access your download file.If you want use that file in your application then you have to decrypt it .There is inbuilt encrypt and decrypt protocol available.(Cipher)
Note
But encrypt and decrypt has one disadvantage it will take time to decrypt file.