I am not a lawyer either but a couple of years of business law and income tax study six months ago tell me it is not that simple. Sure, the employer paid for the software, but if the license is in the
employee's name it could be easily argued that the employer gifted the license to the employee, specially in the absence of any SIGNED agreement, or contract to the contrary, then I feel that it is the employee's property. Possession is strong medicine in our legal system. I know your conscience is clear about the taxes, right?
This is income and should be declared on your tax return (really).
It the end however, SlickEdit decides who owns the software because nobody in their right mind would hire a lawyer to contest any decision of this value.