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FreeRDP is not quite reverse engineered, the software built based on open specification for RDP[1]. That being said, I would be surprised if the FreeRDP contributors did not need Wireshark during development.

[1] https://winprotocoldoc.blob.core.windows.net/productionwindo...

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Didn't FreeRDP start before Microsoft released that documentation?

Possibly? Initial commit on FreeRDP is from 2011 while the oldest version listed on Microsoft's website is v0.01 from 2007. Not sure if that version of the documentation was publicly available.

FreeRDP's roots are in rdesktop which was released in 2001

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