I notice that the Certificate for the ChemDraw Plugin expired Sep. 29, 2000.
Although the certifcate indicates it is expired, the plugin files remain valid. For further details, please see:
What is timestamping? What does it do for me?
It is a well established security principle that digital certificates should expire. Your VeriSign Digital ID will expire one year after it is issued. However, most software is inteneded to have a lifetime of longer than one year. To avoid having to resign software every time your certificate expires, VeriSign and Microsoft introduced a timestamping service. Now, when you sign code, a hash of your code will be sent to VeriSign to be timestamped. As a result, when your code is downloaded, clients will be able to distinguish between:
Code signed with an expired certificate, which should NOT be trusted, and Code signed with a certificate which was valid at the time the code was signed, but which has subsequently expired. This code MAY be trusted.