An authorization creates an association between a database user and an OS platform user identification, allowing external routines to run in secure mode using the context, privileges, and access control granted to the specified OS user. For more information about authorizations, see Teradata Vantage™ SQL Data Definition Language Syntax and Examples, B035-1144. For information about the authorization trusted extensions that you use to access remote systems using QueryGrid, see the Teradata QueryGrid documentation.