Soong - Dec 31, 1969 at 19:00
I am not sure the ScummVM developers would need consent.  All they do is implement an engine that can run SCUMM code.  They did this with other engines too and reimplementing (parts of) the Thimbleweed Park engine shouldn't pose a legal issue either.  However, Ron said he might release the engine code as Free Software at some point.  That would of course greatly simplify the process for ScummVM or similar efforts.