The answer to this question is related to your previous post There are different types of connection type(e.g (RSSL_CONN_TYPE_SOCKET) ? Which connection_type is suitable for us? And how to use/test that conn_type. Which type of data we will receive for each connection type? - Forum | Refinitiv Developer Community
E.g. when to our Cloud based service you would use the encrypted connection type - whereas when connecting to your own organisation's internal servers, you would generally not do so.
The data that your EMA application sees remains the same - as any decryption is done behind the scenes by EMA.