Revert "Update copyright."

This reverts commit 8c558c38232ae9b0e9fecf8990db876a8423efb6.

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Revert "Allow users to view statements and submissions even when their time frames or the contest has ended. But submit solutions, testings and token playings are not allowed."

This reverts commit 1019d467b74d685ec6b0e5bb1e129fcdf5f7977e.

Back to original.