PHPOffice/PHPExcel — pull request #261 by trvrnrth (2013-10-29 11:34:32+00:00)
Title: Add support for reading protected (RC4 encrypted) .xls files

These changes make it possible to read in .xls files with protection enabled.

The decryption functions and objects implemented here are are based on the source of Spreadsheet-ParseExcel:
http://search.cpan.org/~jmcnamara/Spreadsheet-ParseExcel/