tell me why. The protection of trademarks and patents is based on commercial interests. Their exclusivity ranks all competitors, that is, other manufacturers and sellers, because these competitors use my trademarks and patents and infringe on my interests.

the so-called "imitation" for personal use and not circulating in the market is beyond the protection scope of the patent law and trademark law.

The most typical one is the cultural market. I produced a single and played it in the square. You recorded it and then went home to listen to it. This is not infringement. But if you record it and put it on the Internet and spread it widely, which leads to the decline of my single sales, you will be infringed. Or if you record it and sell it to another person (even if one person makes a profit, even if it's a penny), it's infringement. I can go to court and sue you for infringement. As for how to obtain the evidence of your profit and whether it is worth it, that is another story. What we are saying is that qualitatively, this kind of behavior is infringement.

but for personal use, there is no circulation or profit, and it does not cause any damage to the interests of the merchants, so it is not considered infringement.