Hi Jam,
If you're referring to the IRM trial detailed here
http://office.microsoft.com/en-us/assistance/HA010721681033.aspx
then in Word 2003 use Help=>Customer Feedback Options
turn on the 'Search online content...' choice under
the 'Online Content' category.
Then choose the 'Protect Document' Taskpane and select
the 'Restrict Permissions' settings and see if you're
offered a signup for a trial IRM installation.
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I cannot find a download for the free trial IRM service >>
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Let us know if this helped you,
Bob Buckland ?
MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
Office 2003 Editions explained
http://www.microsoft.com/uk/office/editions.mspx