After I implemented and deployed the PDF Unlocking Tool, I was fortunate to find out it became very popular. Apparently I had written and deployed a useful tool.
It's popularity got me thinking, what else I could write that would be helpful to others? Then it hit me, just like PDF files are sometimes restricted, preventing users from copying and pasting their content, sometimes Excel spreadsheets contain locked, uneditable cells.
I started looking around for Java libraries to manipulate Excel spreadsheets, and found JExcelAPI. I started researching this library and sure enough, I found a way to unlock cells in an Excel spreadsheet.
Using this API, I developed an online utility to unlock cells in a spreadsheet, which can be found at http://ensode.net/xls-crack.jsf. It soon became a very popular destination on my site.