how disable PDFEdit combines text from multiple Tj operators

HI

In http://help.adobe.com/livedocs/pdfl_sdk/9/PDFL_SDK9_HTMLHelp/API_References/Acrobat_API_Re ference/PDFEdit_Layer/PDEText.html mention that "PDFEdit combines text from multiple Tj operators into a single text run, when possible "

how I can disable this feature

I want disable this feature because  I write a program that process (encrypt) and copy every element recursively  , I used chain encryption algorithm that mean if one bit change  or shift all result will be wrong

when I  encrypt, for example count 323 run in one textelement but after encryption and when I want decrypt in same textelement I just get 322 run, I think  this problem caused by PDFEdit combines text.

thanks for your help