Adobe open encrypted PDF with expired certificate

Hi,

I encrypt and sign documents with certificates. To do this I use a script and the little program "jsignpdf". The certificates are stored in windows certificate store on the client.This works fine!

The problem is that Adobe Reader (10/11) open the encrypted PDF also when the certificate is expired. I don't find any option to change that.

Has anbody an idea to solve my problem?

The clients have windows vista and Adobe Reader 10. But  Adobe Reader11 have the same problem.

Thanks

Steven