Archivelink - SecKey Generation

Hello Friends,

I am trying to view multiple attachments stored in External Archive link from My Web Dynpro Application. Here is how my URL format looks like.

http://contentserver:port/archivelink/service.aspx?get&pVersion=0045&contRep=SQ&docId=DOCID1, DOCID2&accessMode=r&authId=CN%3DID3&expiration=20090610142210&secKey=SecKey

My code works fine for one attachments but client requirement is to view multiple attachments stored for a business object using SAP Archive Link functionality in web browser.

I am getting SSFResultCode_SignerErrors errors.

Kindly can some body let me know if there is any function module to generate a SecKey for Multiple docI'ds.

Thanks a lot for help.