That’s a license agreement rather than a copyright enforcement.
Their agreement can’t change the law.
Not legally enforcable unless SLR owns the scripts copyright.
This is a given. You can’t own a work you created the derivitive for.
Terms agreement that you can’t sell your scripts in ways that violate this agreement
This might violate most favored nation legalese.
This is not legally enforceable unless somewhere in the agreement it states you are relinquishing the copyright of your scripts to SLR.