If I remember correctly, Nintendo also implemented tough DRM like this for the GBC Video series. Same light gray cartridges, I think.
(GBA Video was a short-lived series of video content available on GBA carts. I remember having a cart with an episode of The Fairly Odd-Parents on it. The video quality was terrible. Nothing worth protecting.)
(GBA Video was a short-lived series of video content available on GBA carts. I remember having a cart with an episode of The Fairly Odd-Parents on it. The video quality was terrible. Nothing worth protecting.)