Yes, they may have rights to this script. But he probably doesn't owe them any documentation and certainly not training or maintenance. Depending on situation,

Yes, they may have rights to this script. But he probably doesn't owe them any documentation and certainly not training or maintenance. Depending on situation, he may still be able to get something from it and probably he should if they didn't want him to automate that and didn't pay him a real programmer's salary.