installed perl-Spreadsheet-ParseExcel.x86_64 0.3200-3.el5

That looks like a version from 2007. Version 0.56 November 9 2009 has this comment

Changed Parse() method name to parse() for consistency with the rest of the API. The older method name is still supported but not documented.

so try

my $workbook = $parser->Parse($input);
poj

In reply to Re^9: protect excel file in perl script by poj
in thread protect excel file in perl script by arunks

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