The problem of multilevel diversity coding with secure regeneration (MDC-SR) is considered. which includes the problems of multilevel diversity coding with regeneration (MDC-R) and secure regenerating code (SRC) as special cases. Two outer bounds are established. showing that separate coding can achieve the minimum-bandwidth-regeneration (MBR) point of the achievable normalized storag... https://thebrickes.shop/product-category/construction-set-toys/