How to make a pivot table uneditable?

It seems to me that pivot tables are by their nature dynamic and meant to be manipulated by users. Are you saying you want to protect the source data or the appearance of the pivot table itself? If the former, I don't think pivot tables can be used to change source data. If the latter, it sound like you don't really want a pivot table published but just the hard data, so perhaps make a copy of the pivot table instead of the "real thing"...

1) Select All cells
2) Right Click Copy
3) Right Click Paste Special Paste Values
4) Right Click Paste Special Paste Formats

Publish the "hard copy" for public consumption. If you want this copy to always be up to date, record your steps with the macro recorder and have the pivot table copied to a new sheet whenever you close the workbook with the original.

HTH,
Alex