Hello Jeka,
there are infinite possibilities to don't display a field.
On your side, you need multi fields check. an other guy will need to check fields and database, ....
There is no limit!
So for custom need you can use a
beforerender plugin to make all your checks and if you want to not display a fields, simply unset it from the $fields array.
If it's over your PHP capability and you need help, you can have a look to our
support package.
Regards.
Lionel