What you own is to experience the work in the way the creators intended for their audiences, and malleability gives you the opportunity to adapt it for yourself and your audiences.
Interesting to consider how the tools used are a kind of “man-in-the-middle” and how that might influence that ownership relation.
Consider hypothetically how a “one-stop-shop” future Github might host iNaturalist on Azure and facilitate commenting in the UI that is cross-linked to that PDF paper and stored as issues in the repo’s tracker. Very convenient tool, but now GH has its claws deeply into the work as a co-owner, and is encroaching further with every feature it adds to its platform.
Update: Cross-ref to Making networked software our own by @akkartik appropriate.