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iText - remove previously inserted over content text - Help Needed

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Hi, I could really do with some urgent help on this. Searching the Web to get a good example on this issue is very scarce.

Basically my requirement is that I stamp existing PDF documents with certain text and save it. This I have working fine(& Lots of examples on the Web). However, if later on I want to remove the text that I added to the PDF, I am having problems with. There is very little information on how this is done - Its like a BIG SECRET!!

To add my text as an over stamp, I do something like this which works fine:

REMOVING The Text...

I found someting which indicated that removing the added text requires a lot more work. Whereby, a program would need to read the individual pages resources & remove XOBJECT's. So I have this peice of code:

Apparently the calling of is supposed to remove the XOBJECT elements in that page of the PDF & thus remove the over context text that exists in the PDF. However, When I run this code, nothing gets removed. Infact, when debugging I dont see any XOBJECTs at all!

Appreciate any expert help in this matter
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