The 1964 Rudolf the Red Nosed Reindeer TV special is in a grey area of copyright

Amazing fact about Rudolf the Red Nosed Reindeer: 

Did You Know? The 1964 Rudolf the Red Nosed Reindeer TV special is in a grey area of copyright due to the fact that the studio mistakenly spelled out the copyright date as 1164 in roman numerals and haven't corrected it since. source

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