Some software licenses can be resold. Check the original EULA. Buyer beware: ensure the seller transfers ownership officially.
No known mainstream product.
Given the lack of official “OCAM” product pages, any serial key offered online is almost certainly: ocam serial key
If the software is truly abandonware (no vendor exists, no longer sold), running it inside an offline virtual machine with a legally ambiguous “educational use” key may be a gray area – but still not recommended. Some software licenses can be resold
A French software tool used in laboratory or industrial measurement analysis. This is a niche, possibly legacy application no longer actively sold. If the software is truly abandonware (no vendor