EA Has Done Something Wonderful That Every Major Publisher Needs To Copy:
https://kotaku.com/command-conquer-ea-source-code-red-alert-generals-1851767009
https://kotaku.com/command-conquer-ea-source-code-red-alert-generals-1851767009
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It also makes good business sense, at least it has worked for us at Nightdive: https://www.gamedeveloper.com/programming/nightdive-shares-source-code-for-i-system-shock-i-on-mac