Yes it does rest on it in a way. You don’t need to establish perpetual ownership,no, but your argument does rest on the idea of ownership, even if temporary. Because that “agreement” rests entirely on the premise that the innovator owns these exclusive rights to this idea and no-one else, that’s why you think the DVD buyer cannot legitimately use it the same way the innovator can unless he “purchases” this exclusive right first. But my point is that the copyright holder does not in reality have this exclusive rights that he can exchange with others at all, rights that he can legitimately “sell” and others can “buy”. Agreements (Contracts) are based on the idea that each party has something to exchange, not just that they agree. I can promise to let you take a picture of the sea if you pay me- If you did not pay me and went ahead on your own and took that picture, no real violation in justice occurs, because I had no right to try to sell you the view of the sea to begin with!
The ownership that enables this agreement is an artificial creation of the Government that has no real roots in real rights possessed by these parties. Like if the Spanish Government had decided to create such rights for Columbus over the Americas, so that any who wanted to come to the Americas would buy this right from Columbus, or any who wanted to profit from them would have to buy it from him. This is an artificial ownership because it is merely designed to reward Columbus for his hard-work and imagination and investment that has lead him to discover what is a treasure for all humanity, not just him. In moral law, as I see it, that agreement only has force because of the authority of the Government and its just motives in exercising that authority in that manner, not because the agreement itself is good and must be obeyed in justice, morally speaking. The just motives of the government are:Reward innovation and ensure the continuance of innovation and creativity for the good of society. So it comes down to the authority of the Government exercised for the good of society, not any true agreement rooted in any real rights that we can legitimately exchange for money.