For that matter the 'private one copy per user', is even simpler to maintain without actually requiring to store multiple copies. All they need is a deduplicati

For that matter the 'private one copy per user', is even simpler to maintain without actually requiring to store multiple copies. All they need is a deduplication mechanism at the storage layer, and store the files block wise. Legally they could prove that they are recording a copy per user, while they would be paying close to a single copy cost in terms of storage.