Autodesk Canada earlier this month settled a law suit it was planning to bring against Assimilate. Assimialte's press release relates the tangled tale:
The lawsuit... was based on Autodesk Canada’s purchase of the intellectual property, including copyright interests, in a software program called Cyborg from an English company, 5D Solutions, Ltd. The Cyborg software provided digital compositing, color correction and various editing and art functions for the post production and visual effects industry. The lawsuit alleged that Assimilate’s software program, known as Scratch, infringed Autodesk Canada’s copyright in the Cyborg software.
...Assimilate acknowledges that it used code and design elements from Cyborg in its Scratch product. Assimilate... has received a perpetual license back from Autodesk Canada for use of that code and those design elements and a release for any past use of that code and those design elements.
Big sign of relief all around.