using PKCS#7 object to encypt Public Key Recipients string

Hi,

I'm trying to develop application to handle Public Key encryption file. According to PDF specification. There is a Recipients entry in pdf encryption dictionary for Public key encryption pdf file. The Recipients String is in PKCS#7 format. the most common used PKCS#7 parser is dumpasn1 and openSSL. But for some reason, both parsers have problem to process this Recipients string. Does any one know what's going on? Is the Recipients string in standard PKCS#7 format?

Also, the Object Identifier I extract from this string is 1 2 840 113628 114 1 7. And it does not match any known OID repository. Can any body know if this is a valid OID?

Thanks.