[PCB_FORUM] Determining if padstacks have changed inside a board file

I was wondering if anyone had any ideas on how to determine if a padstack 
has been modified inside a design. We are in the process of updating our 
padstack library to take advantage of the tolerance feature and to change 
the soldermask opening.  I have found out that some designers had been 
changing drill sizes and anti-pad sizes in some designs by modifying the 
padstack and not replacing it with what they really needed. If I now 
refresh the padstacks, I'll get the original library versions that will 
cause fab problems.
So, I'm interested in anyone's comments on how to discover these changes 
before the update occurs or a way to compare the designs after an update.

Thanks,
Don ...........................

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