We study a dynamic durable-goods monopoly model of differentiated digital goods. We establish a folk theorem: when agents are sufficiently patient, any seller payoff ranging from the lowest buyer valuation up to approximately the static commitment monopoly payoff can be sustained in equilibrium. This result emerges from two fundamental characteristics unique to digital goods: free disposability on the buyer side and zero marginal costs on the seller side. Our analysis provides economic intuition consistent with empirical evidence documenting substantially higher markups in digital-intensive industries compared to traditional manufacturing sectors.