Attachment is: when the debtor fails to pay according to the terms of the security agreement. the process of a secured party obtaining a security interest in the collateral that is good against the debtor. a document filed by the secured party to give notice of its security interest in the collateral. the process a secured creditor would take to protect its rights in the collateral against all other potential creditors. Attachment is: when the debtor fails to pay according to the terms of the security agreement. the process of a secured party obtaining a security interest in the collateral that is good against the debtor. a document filed by the secured party to give notice of its security interest in the collateral. the process a secured creditor would take to protect its rights in the collateral against all other potential creditors