Locked cells show up in Apple Works
 

Hello,
I sent a doc created in excel 2003 and hid columns and locked parts of the
worksheet. To my surprise, the person on the other end was looking at and
could manipulate the locked cells. They said the doc opened up all cells in
Apple Works. The program indicated they were locked, but they were still
allowed to delete the cells and manipulate the doc.

Does anyone know how to prevent this from happening?
Thanks
Uttster