I've posed this question to support before...here's the response
that I got 2/2/1999:
        Tim,

        The problem we have is that you cannot un-register a single license
..
        What you can do is delete a file "nodelock" it resides in

        "/usr/lpp/adsmserv/bin/" .. if you delete this file it will
un-register
        everything.. then you will have to go into ADSM and re-register what
you
        need .. It's kind of a pain, but it shouldn't take but a few
minutes..
        This is for version 3 of the server .. in version 2, the file was

        "adsmserv.licenses" ...
        FYI Thanks Tim






        "Johnson, Brian" <BrJohnson AT EXCHANGE.ML DOT COM>
        08/28/2000 01:30 PM
        To:     ADSM-L AT VM.MARIST DOT EDU@SMTP@Exchange
        cc:

        Subject:        License Question

        I'll ask a silly question,
        We have an AIX TSM 3.7 Server and when I do a "q lic" someone has
obviously
        done a "reg lic file=*.lic"

        How can I unlicense some entries ??

        TIA


        Regards,

        Brian Johnson
        Storage Strategy Team
        Tel: 212 - 647 3557