The arrest of Megaupload's founders has led to other file storage sites taking action in an apparent attempt to protect themselves from legal action.
Filesonic has disabled its sharing functions, allowing users to access only their own files.
Uploaded.to has blocked US access to its site entirely, with a message saying "sorry about that".
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"If those websites are found to be communicating the works - ie facilitating sharing - then that's the key risk in terms of criminal liability," said Adam Rendle, a copyright lawyer from London-based law firm Taylor Wessing.
http://www.bbc.co.uk/news/technology-16679174