seccure-decrypt: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/seccure-decrypt - from package: seccure

You may install the required package with command apt-get install {package}

Error in other languages:
seccure-decrypt: bevel nie gevind nie
seccure-decrypt: comandă negăsită
seccure-decrypt: comando não encontrado
seccure-decrypt: commande introuvable
seccure-decrypt: command not found
seccure-decrypt: käsku ei ole
seccure-decrypt: không tìm thấy lệnh
seccure-decrypt: komanda nerasta
seccure-decrypt: Kommando nicht gefunden.
seccure-decrypt: kommandot finns inte
seccure-decrypt: komut yok
seccure-decrypt: nie znaleziono polecenia
seccure-decrypt: níor aimsíodh an t-ordú
seccure-decrypt: no se encontró la orden
seccure-decrypt: no s'ha trobat l'ordre
seccure-decrypt: opdracht niet gevonden
seccure-decrypt: parancs nem található
seccure-decrypt: perintah tidak ditemukan
seccure-decrypt: príkaz nenájdený
seccure-decrypt: příkaz nenalezen
seccure-decrypt: команда не найдена
seccure-decrypt: командата не е открита
seccure-decrypt: 命令找不到
seccure-decrypt: コマンドが見つかりません