rdisp/TRACE_HIDE_SEC_DATA is a SAP Parameter attribute which is used to control Set hide mode for developer trace information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
In addition to the program flow, the developer trace also contains parts
of the received data and sent data. However, security-related parts of
the data, such as passwords, are excluded. In exceptional cases, it can
be necessary to store complete data ranges in the developer trace to
analyze a problem. You can use the parameter rdisp/TRACE_HIDE_SEC_DATA
to configure this.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.