Digital Signature in cFolder.

Hello Folks,

We are working on SRM 7.0 , using Digital Signature Functionality in RFX bidding process.

We are able to digitally sign the document while attaching from RFX , but not happening the same way when attaching documents from cFolder.

Can some one suggest how can we digitally sign documents while attaching from cFolder.

Is there any BADI for this?

Is there any third party tool required for this , outside SAP standard ?

Awaiting Reply.

Regards

Anshul