No relation. Data mining is just a fancy term for searching in a database. For example, finding running sneakers on Amazon is a sort of data mining. And, it seems like you already know what data hiding is.

Hi,

Data encapsulation is another format into wich we want to integrate a software for example, not with the idea to hide data.

In computer forensics: Data mining is an extraction to find useful information an example of dumpster diving. Hiding Data is art and a science of concealing information either simple obfuscation methods or use of data hiding methods of: Out-of -band, In-band, and Application-Layer Steganograhy hiding information within data or hiding information in documents.

Data hiding is a software development technique specifically used in object-oriented programming (OOP) to hide internal object details (data members). Data hiding ensures exclusive data access to class members and protects object integrity by preventing unintended or intended changes. Data hiding also reduces system complexity for increased robustness by limiting interdependencies between software components. Data hiding is also known as data encapsulation or information hiding (https://www.techopedia.com/definition/14738/data-hiding).

Data mining is a process used by companies to turn raw data into useful information. By using software to look for patterns in large batches of data, businesses can learn more about their customers and develop more effective marketing strategies as well as increase sales and decrease costs. Data mining depends on effective data collection and warehousing as well as computer processing (https://www.investopedia.com/terms/d/datamining.asp)