Free as in beer only:
> Building Superbacked from source code or using official releases is allowed for personal use only.
> Unauthorized distribution or usage of this software (including its source code) is strictly prohibited.
You really should use a law firm to manage anything you want passed on after you die.
Trying to come up with your own solution to this is a very "roll your own auth" approach to such an important thing.
Free as in beer only:
> Building Superbacked from source code or using official releases is allowed for personal use only.
> Unauthorized distribution or usage of this software (including its source code) is strictly prohibited.