Can't login/forgot password of my encrypted DVDs

A few years ago, I password-protected some of my DVDs using an encryption software called CD Lock, and I used those DVDs regularly using the same password without problems. Recently the program started to refuse my password, so I attempted to contact the vendor, no reply. Tried a few things like closing the antivirus, entering it on a fresh machine, even on Windows 2000, just in case. There is no way I can believe I forgot the password, it feels so lame, but I suppose I should give up trying to remember, cause it's started to give me serious mental strain :tired

So, is there anything I can do before throwing these Dvds away, like using some decryption software? Thanks to everyone who has read this far, any ideas will be appreciated.