Able to clear signatures in a certified document in Acrobat 9.0

Hi
While testing Acrobat 9.0 feasibility for migrating my application from Acrobat 7.0, I stumbled upon a security issue that the signatures can be cleared in a certified document (Only Form Fill in and digital signatures are allowed) by right clicking and selecting Clear
Signature. After clearing the signature, the document status still remains valid i.e. it doesn't gets invalid even if the signature is cleared. Below are the steps to reproduce the same.
1. Certify a document having couple of signature fields by selecting Certify with Visible Signature and
i "Form fill-in and digital signatures"
as the Permitted Actions after Certifying.
2. Close and re-open the document.
3. Sign a signature field.
4. Close and re-open the document. Right click on the signed signature field and select Clear Signature.
5. Save the document, close and re-open the same. The signature is cleared
and the document status is valid.
This behavior is different from Acrobat 7.0 where
A) User is unable to clear a signature in a certified document
B) Even if he somehows clears the signature, the document certification becomes invalid.
Also, if you right click on the certifying signature in Step 4 above, it also can get cleared.
This behavior of clearing the signatures in a certified document nullifies the purpose of a certified document to prevent users from changing a document. Also, the option of locking the signature during the certification process is missing in Acrobat 9.
Please let me know whether this is a bug or expected behavior.

Below is the example of difference in behavior of Acrobat 7 and 9.
In case of Acrobat 7, there was no option to clear a signature field in a "certified" document i.e. if I sign and right click on a signature field inside a certified document Acrobat 7.0, the Clear Signature option is not present.
However, if I sign the same signature field in the same PDF in Acrobat 9 and right click, Clear Signature option is available and am able to Clear the signature.

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