Locking PDF but only allow further signatures & get the list of of changes made after signing

Hi,
I have looked at Adobe Acrobat 9.0 and found the Signing > locking feature which blocks any changes after the document is signed. I need to know whether using Acrobat SDK, one could implement a similar locking option via plugin in a way that it ONLY allows further blank signature fields to be created or sign existing ones and locks all other changes. If possible, any pointers to API functions would be appreciated.
If the above is not possible using Acrobat SDK 9.0 then can the SDK provides a list of all the set of changes made after the signing is performed (at the time of verification) in the form of some codes which can guide the plugin author about what change after signing was done e.g.
a blank signature field was signed
a blank signature field is created
watermark has been applied
form is filled
sticky notes/stamps/other annotations are added
Regards,
mwak

Thanks for your response. I have just performed this:
I signed a PDF ( having no prior signature or blank signature fields ) using Adobe Acrobat 9.0 and locked it. I am now not able to create more signatures on this PDF. I believe I can't add more signatures even using the Acrobat SDK and Lock means complete lock-down of the document. This is different to what you said " it restricts modifications EXCEPT for other signings" or may be I am not understanding it clearly.
I created two blank signature fields. When I clicked on the first, there is no Lock settings at the time of signing. I believe because If it is locked then the next signature can't be signed. With only a single signature field present, the lock feature is there.
So I believe I have to resort to the option of identifying the changes in a revision and then if it the change is related to say adding stamps, sticky notes prompts the user at the time of verification.
Can some one point me to the API functions set which identify list the objects which have changed after signing.
Regards,
mwak

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Locking PDF but only allow further signatures & get the list of of changes made after signing

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