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One of the most fundamental features of any system is the ability to secure the data that is being stored and processed. When developing any type of app, we should always keep security at the forefront of our mind, especially when our apps display or process any form of data.

We need to ensure that the users have access to only the information that they are authorized to see, and that their levels of access are not higher than what they need to be able to perform their duties.

In previous chapters, we investigated retrieving and displaying data from data sources. We will now start...