In the show there was that scene where the little Arjuna sees Bheem eating in the darkness and it inspired him to practice shooting arrows in the dark. In this scene Drona applauds him and acknowledges his efforts of trying his hands at something Drona had not taught yet.
In the same show, Drona gives the excuse for Eklavya's cut thumb ke Ekalavya that "he had stolen his knowledge" and hence wasn't worthy of his talents.
Now, I know neither was the Arjun scene in the texts, and nor did Drona go about explaining his stance on Ekalavya to everyone.
What I'm wondering is that what is the "stolen vidya" is then? Both Arjun and Ekalavya were extremely intuitive and learned a lot from their surroundings. Why then, one was called a prodigy and the other a thief?
Mind you, both of them acknowledged Drona's "mahatva" as a source of their prowess.
Was the only dividing factor here that one had the explicit blessings of his Guru while the other hadn't?