I'm sorry that you're having trouble with your PDF file. If you saved it in Acrobat without any password (Open password, or Access rights password), it shouldn't have been locked automatically. Are you getting an error when you try to open it, or are you prompted for a password? Is it possible that it's locked by the OS and not by Acrobat? If that's the case, you should be able to unlock it. If it truly does have a password applied in Acrobat, you would need that password to open/modify the file.