If you are referring to an unofficial streaming or download site using “Blurayku” in its name (common with some regional pirate or fan subtitle sites), I cannot produce a report that would promote, validate, or analyze unauthorized access to exclusive Blu-ray content.

However, if you are looking for a general guide to exclusive Blu-ray/4K film releases (often called "retailer exclusives" or "label exclusives"), here’s what you need to know:

We are entering the era of the "Super Fan Economy." Studios realize they can make $60 off one hardcore collector buying a premium exclusive rather than $10 off a casual fan buying a standard disc.

It seems "blurayku" is not a mainstream or well-known term for physical media (like Blu-ray, 4K Ultra HD, or boutique labels such as Criterion, Arrow, or Vinegar Syndrome). It may be a typo, a very niche fan site, a foreign retailer, or even a placeholder name.

• Vinegar Syndrome (US): Known for "secret" exclusive slips that only go to subscribers.
• Second Sight (UK): Their Drive 4K exclusive is the current king of the format.
• Arrow Video: Their limited edition exclusive hardboxes often go out of print within a week.

: These are known for limited edition collectible packaging for films like Batman Returns Gemini Man Special Packages : Some films, like COLORFUL STAGE! The Movie Special Package Limited Editions that include soundtracks and illustration collections. Legal Streaming/Downloads : Platforms such as iTunes (Apple TV) Amazon Prime Video provide authorized 4K/UHD content. Safe and Free Alternatives