Returns a decoder object for the source block with the provided source block number.
Bounds checking - If we have {@code Z} as the number of source blocks into which is divided thethe source data being decoded, then the following must be true, otherwise an {@code IllegalArgumentException} isthrown:
{@code sbn} ≥ 0
{@code sbn} < {@code Z}
@param sbn A source block number
@return a decoder object for a specific source block
@exception IllegalArgumentException If the provided source block number is invalid
@see #numberOfSourceBlocks()
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