The alienation of property without the permission of the High Court is:

A transfer by a competent owner needs no permission of the High Court: under sections 7 and 8 of the Transfer of Property Act, 1882, a person competent to contract and entitled to the property may transfer it, and the transfer passes all his interest. So an alienation without such permission is "Valid". It is not void, voidable or illegal unless a special law requires the court's sanction, as for a guardian's disposal of a minor's property under section 8 of the Hindu Minority and Guardianship Act, 1956, which is voidable.