Get rights of registry entry

Hello,

does someone knows a way to detect the rights of a (currently logged in)
user on a registry entry (key or value)?
The simplest way seems to try reading or writing and catching any exception.

The reason behind is to detect if a user can modify a specific value and
allow him to change value (Edit field) or display him the value without
chance to edit (read only) if he has no "write access" rights.

thanks,
Gunter