Copyright is Brain Damage - Nina Paley Ted Talk
Hyperlink assets, describe indexing of assets, and allow runtime merging or compile-time merging of unlicensed content.
Allow a user to have thier own licensed copy of a music soundtrack (such as owning a physical Compact Disc music album / track) and reference it. Cue outside assets / parallel assets.
Placeholder generic public domain assets that can be upscaled / upgraded. Low-budget performners acting out lines that can be upscaled // upgraded to professional popular actors.