How is Black Mesa legal?

Question

The decision to sell Black Mesa is based on the fact that the developer wants to make the game as good as possible, and that requires full access to the Source engine, and the project lead admitted that the team could really use the financial help. This isn't a big surprise for a developer.

Hagrid P Hazard · Accepted Answer

The decision to sell Black Mesa is based on the fact that the developer wants to make the game as good as possible, and that requires full access to the Source engine, and the project lead admitted that the team could really use the financial help. This isn't a big surprise for a developer.

How is Black Mesa legal?

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