Although no cause for the blocking of YouTube by service provider Maroc Telecom has been ascertained, the current speculation is, as Moonlight [1] mentions, is:
La raison de cette censure serait la publication par ce site de 2 vidéos d'un islmaiste malade mental qui (en cachant bien son visage bien sur) a parlé de la fortune du roi en l'insultant.
Maghrebism is encouraging readers to sign a petition for Maroc Telecom and parent company Vivendi to restore YouTube access:
The Moroccan government is usually very sensitive to media-attention. They are often very afraid that their image of a moderate, safe and open muslim country will be damaged.
Not realizing that they damage that image themselves.
So please sign and digg [2] away because that is the only way to make them realize that what they did is wrong.
The petition can be found here [3].