I was 'secure in the belief/knowledge' that I had done all I could. [=I felt confident because I believed/knew that I had done all I could]
They are 'financially secure'. [=they have enough money to live on; they do not have to worry about money]
You can access your bank account online using a 'secure' [='secret'] password.
(..) And where is the press conference? Go under the arch... ...through the door on the right and down the hall. Well... The area is still secure. Thank you. He's perfect. Yes, we have definitely found our man. Why do I feel wet? (..)2006 The Pink Panther
(..) - No. No, not at all. No. Clouseau, the reason we called you here... It is lovely weather we are having. I hope the weather continues. The area is secure. Oh, thank you. Clouseau, I have reviewed your records, and it is clear to me... ...that a man of your talent merits greater responsibility... (..)2006 The Pink Panther