The Tanker Objective-C SDK adds a layer of security that encrypts every user action, and features automated identity management. Tanker offers an Unlock service that allows users to access encrypted data seamlessly across devices.
The newest version of the Google Drive API should help developers more easily add Drive to their own apps. Google says the improved API is more consistent and simpler for first-time developers. Drive within apps can be used for file storage in addition to creating and editing files.