The problem is a law in the pipeline that would make it obligatory immediately for old items (even cheap ones, like coins) to show 20 years back of sales records on sale. In other words, in order to sell an old coin under German law, it would become necessary to show who you bought it from and when, up to 20 years back.
The petition is drafted by Ursula Kampmann, who is a serious author on classical coins.
Yes, cultural heritage needs protecting and no, not everything old is cultural heritage. My impression is that the wild-eyed faction of archeologists has succeeded in shooting themselves in both feet. It might actually be helpful if the law goes through, as it would rob these self-appointed anti-collector terrorists of their undeserved credibility. If the law is stopped by actions such as this petition it's OK also, I guess. The main thing is to show that this kind of flagrant fanaticism does harm, not good, so it won't spread to other countries (dare I mention India?)