The process was figuring out that we in no way mix any GPL code with our own code. As long as we don't do that it's fine but we still have to make sure every time we touch anything GPL'ed.
My personal opinion is that it's because the term 'a work' which is used liberally in GPL is a legal term and can potentially be interpreted quite broadly. This means that we have to ensure - every time - that what we do does not constitute 'a work' which derives from GPL code - in the legal sense - if we do not want to distribute the source code that we create.
With BSD we don't have to go through that process because it will not result in us losing control over our own software. We just need to stick a disclaimer in a license file and we're done.
My personal opinion is that it's because the term 'a work' which is used liberally in GPL is a legal term and can potentially be interpreted quite broadly. This means that we have to ensure - every time - that what we do does not constitute 'a work' which derives from GPL code - in the legal sense - if we do not want to distribute the source code that we create.
With BSD we don't have to go through that process because it will not result in us losing control over our own software. We just need to stick a disclaimer in a license file and we're done.