Early great masters took ordinations, teachings and Initiations from everywhere, even from beggars until lately everyone has become very secluded. Teachings of the Buddha or Buddhism are at least not copyrighted at all, to convey its best wishes to the stages of development or capacities and capabilities of sentient beings. 

If we're initiated in one of any of the higher tantras from any Tibetan Buddhist empowerment, it has at least opened the doors to study various teachings of high level tantras without using them for ones own luck, gain, fame, mock interpretations, misuse and misbehaviours. If this were to occur, one would descend to vajra hell and bad health and sudden death in this life would follow.