@Paul: Thanks a lot, I didn't know that, it's not the perfect solution but worth a try I will push my manager to upgrade our Livecycle server

@Paul: Thanks for the input, but I tried and Acrobat refuses to flatten this form "This PDF document contains an Adobe XML form. Such files cannot be optimized."...

Thanks for your reply... The marker idea is an interresting one, but we would the rely on javascript to process and remove them...Actually, we are using PDF forms as application forms for a R&D funding program. The idea of this comparison tool is that we would use it to highlight differences between...