How to declare a license for a LiveCode Stacks

[Sivakatirswami]

  I'm a bit confused about using a MIT license to release some stacks. 
Don't we also need to enforce subsequent users to be valid holders of a 
LiveCode License?

And should we add RunRev company to the closing indemnity clause?

I've done both below. Does this work?

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Open Source Initiative OSI - The MIT License:Licensing
[OSI Approved License]

The MIT License

Copyright (c) 2010, Himalayan Academy

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to 
deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software. You must be a valid 
holder of a LiveCode License from RunRev to modify the Software and hold 
a professional LiveCode License if you wish to sell copies or modified 
copies of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS, OR RUNREV BE LIABLE FOR ANY CLAIM, DAMAGES 
OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.