A former Goldman Sachs programmer saw his second criminal conviction dismissed on Monday in a long-fought, technically challenging legal battle that centered on 32MB of copied code.

The dismissal marks a significant victory for Sergey Aleynikov, who was a highly paid programmer for Goldman’s high-frequency trading operation, designing complex code to make split-second trades.

Aleynikov won an appeal against federal charges in April 2012, but prosecutors refiled new charges against him under New York state laws different than the federal acts he was previously accused of violating.

In May, he was convicted by a jury of one count of Unlawful Use Of Secret Scientific Material, a rarely-used statute enacted in 1967. The jury did not reach a verdict on a similar count and dismissed another count of unlawful duplication.

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