Technical Packaging: What the Label Means The label you quoted is common in digital distribution and fan communities; it encodes important technical and localization details:
Warning: Mild spoilers ahead.
There are also legal and ethical aspects to consider around distribution labels of this sort. Properly licensed Blu-ray releases and authorized streaming are important for compensating creators and rights holders; unlicensed distribution undermines that ecosystem and can harm the industry that produces such complex period dramas.