restrict access for an user doesn't work, again

hi, I fixed partially my problem. before granting select to the user, I have to revoke all on this table frompublic. But it doesn't work when the table belongs to another user although I use Informix id. I'm using IUS 9.14.UC3 on solaris 2.5.1 Suppose we have three ids informix, visitor who can just select table and the table's owner O. O create a table with this request: create table test (foo interger); Oddly Informix can't change the privilege on the table test visitor have the connect privilege. O have the resource privilege. Using this request by Informix doesn't work: REVOKE ALL ON test FROM public; GRANT SELECT ON test TO visitor; I need to be O so that request works. Is it normal? thanks for your help. georges