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Why are some of the movies, like Silent hill revelation, rent only?

Licensing unfortunately. The deals for TV Shows / Movies are very complex and it's one of the reasons why it's so complicated / almost impossible to transfer purchases from a country to country.
 
I've also seen movies that were rent only for years become available for purchase only for a week or two then disappear from the store completely.

These were old movies too like from the 80s.
 
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