n10 Although the term "security" may denote a lien, it is also used in a broader sense; "whenever the performance of some undertaking is necessary to secure or preserve the value of some asset or other agreement, we could possibly refer to the undertaking as one that has been given 'as security.'" (Greve v. Leger, Ltd. (1966) 64 Cal.2d 853, 858 [52 Cal.Rptr. 9, 415 P.2d 824].)