USB TO HDMI ADAPTER works perfectly, except for streaming?

Bought a USB to HDMI adapter, it works great (pictures, videos, youtube etc.) windows 10)
However, not when streaming movies on Netflix, Amazon prime videos.

Why? How could I solve the problem?

I had a similar problem once, because the adapter did not support the HDMI standard HDCP.

Is probably a kind of copy protection. It was then possible with a different adapter

Your problem is that the adapter does not support HDCP. The netfilix content is all copy-protected. You need an adapter that can hdcp.

Did you specifically buy one where that was possible? Or are most of them equipped with HDCP?

To be honest, I'm not sure if most of them support it. Afterwards I bought one that specifically said that it would be supported.

Which adapter did you buy if I may ask? Because on Amazon it is quite difficult to find one with Hdcp

I searched again but couldn't find which one I bought.

Okay thanks anyway