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

 product-name[,...]

    Name or names of products with a license that you want to
    disable. You can disable only licenses that currently exist
    in the License Database. Enter the product name exactly as it
    appears on your Product Authorization Key (PAK).