It's rather complicated to explain.
Almost all commercially working tradesman and workers/employees in Germany are insured, I say almost because there are exceptions - I won't go into those.
No matter what trade, they all have a branch of insurance, there are 9 of them. Additionally for the workers/employees not in a trade but other fields, there are 24 accident insurance companies. All of them are statutory. All of them together are known as: German Statutory accident insurance (DGUV).
They, by law, are entitled to make rules on everything that you would know as OSHA standards. In Germany, the part of accident prevention, is called UVV (Unfallverhütungsvorschriften = Accident Prevention Rules).
DGUV - in the end - is overseen by the German Federal Ministry of Labour and Social Affairs.
Now getting to the riving knife.
If you look into the DGUV rules for carpenters:
https://www.bgbau.de/fileadmin/Medien-Objekte/Medien/DGUV-Regeln/109-606.pdf(Sorry, I don't have a link to an english language version of this document.)
It says which type of saws need a riving knife. In case of handheld circular saws, it says that it needs to have one, with the exception if the saw is compliant with exceptions laid out within DIN EN 60745-2-5 standard (Title: Hand-held motor-operated electric tools - Safety - Part 2-5: Particular requirements for circular saws (IEC 60745-2-5:2010, modified) )
I can't go deeper into this, because I don't have access to this document, in Germany the standards are not public domain, you need to buy these.
Now what
this means is:
If you are a carpenter with statutory insurance, you need to abide by this rules.This does not mean a manufacturer is barred from building a tool that is in one point or more, non-compliant with these rules. As long as it is generally safe, abides by a thousand other rules, he can put it on the market and sell it.
The catch is, a tradesman with statutory insurance couldn't use it on the job/commercially. If he did and an inspector came and noticed it, he would order the tradesman not to use it.
So if you want to sell tools to commercial users bound to the rules of statutory insurance, you need to abide by their rules and build your tools accordingly.
So when Mafell says, they were authorized by the government. What they mean is that they got a change of code/standard approved for a circular saw that has another safety device in place instead of the classic riving knife. And the statutory insurance rule makers decided that was good, and referred to this chapter of the standard for eligible exceptions from the classic riving knife on hand held circular saws.
Since the government oversees those who make the rules and refer to standards that are to be adhered to, they were right in their wording.
I really hope this is understandable. I tried to be as specific as I could but I'm no expert on this either. I'm sure there are more details, more steps - but it sums up the end result just fine.
Let's leave the EU out of it, the cited standard was already harmonized (EN). That would only fill more pages.
Kind regards,
Oliver