With the new Adobe Acrobat update, the password for security envelopes is no longer required to open the document. When creating a security envelope, you select files to add, thus enabling multiple documents to be protected under one "envelope", requiring only one password to open them. When you create a "security policy" for that envelope (which you can continue using for future envelopes), normally it sets a password that you have to type in before you can open the envelope and see all the documents. This password no longer works and you can open the envelope freely. Adobe Support reinstalled an older version of Acrobat for me, and it worked again, so it's a bug with the new update. However, my computer automatically installed the new update again (even though we checked the "do not automatically install" button), so now my password doesn't work, again. So annoying. Please fix.