How to privately store videos on sd card

I'm a beginner to android and need some help. The app I'm making lets the user purchase and download high resolution videos from a server. These videos are stored on the SD card.

This creates two problems for me:

1. Once on the SD card the files can be publicly viewed and copied to other locations.
2. When the app is uninstalled the files remain on the SD card and take up a lot of space.

My questions:

1. Can I make the videos private to my app? From what I understand storing to Internal Storage provides that privacy. However, Internal Storage is not the SD card and therefore provides only limited space - and the videos require a lot of space.

2. When the app is uninstalled - is there a way to make sure the videos are removed from the SD card.

Please tell me if you ne开发者_JAVA技巧ed more information! Thanks for being a great community!

You can encrypt your videos using a block cipher stream.

CipherOutputStream

If you place a file on the phone there is nothing that can stop a user from getting access to that file you create.

Getting rid of any videos the application is easy just keep track of it.

I suppose you could encrypt the file which would prevent most users from downloading the file off their phone.

you could always embed the videos in a sqlite database and then lock down the db. That way when you uninstall it takes the videos with it.