isa server 2006 licence problem?

hi, "isa server 2006" I want to use. "server 2003" will build on. "If the server 2006" Can I continue to use after the expiration of three months of free usage rights.

3 months free use of the right, then what happens when I do not get the license? "ISA Server 2006" Can I continue using? My only "microsoft server 2003" got my license.

Thank you.

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