/sys$common/syshlp/helplib.hlb LICENSE, UNLOAD, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 product-name[,...]

    Name of the product to be unloaded. You can unload only licenses
    that have been loaded. Enter each product name exactly as it
    appears on its Product Authorization Key (PAK). You cannot use
    wildcard characters for product-name.