Again.
You can patent a magic trick or device. That puts the description of the patented material in the public domain. Patents are by definition not secret, they are public record and every patent is available to the public, see Search for patents | USPTO where you can search everything.
Reading a patent, and describing how the patented material works in your own words does not violate any copyright.
So if you read the patent of a patented magic trick, and write an article about the patented trick that discloses how the trick is performed, you have not violated any laws, committed any crime, or exposed yourself to any civil liability. It doesn’t matter if this is written, or audio, or video, or how your piece is distributed.
Just like if someone invents a new type of paper clip, you can write an article about the paperclip that discloses completely how the paperclip can be manufactured. The patent itself does this, and any secrets the patent holder keeps to himself will not be protected under patent.
All a patent gets the patent holder is the right to sue violators for damages. No one will enforce your patent for you, you must do so yourself through the court system. So if I perform a patented magic trick or make a patented paperclip in my bedroom with the windowshades drawn and the lights off, no one will ever know and so the patentholder will never be able to sue me.
If I made a bunch of paperclips and handed them out to my friends for free it is very likely that the patentholder will never know what I’ve done. But if he does find out he can sue me for damages, despite the fact that I didn’t sell the paperclips. Selling the patented item is not the only violation, manufacturing it is also a violation, as is distributing them. But the patentholder has to find out, they have to hire a lawyer, they have to take me to court, they have to show damages. Handing out a few free paperclips doesn’t create large damages for the patentholder, so they may decide it is not worthwhile to sue me, maybe they just send me a threatening letter.
Of course, the vast majority of patents are completely worthless, nobody every manufactures or sells or distributes the new and improved patented paperclip. That doesn’t matter.
And of course, the vast majority of magic tricks are not patented, rather they are trade secrets. Trade secrets have some protections–you can’t legally steal them, for instance. But anyone can reverse engineer the secret, figure out how it’s done, and copy it.
And also revealing the secrets might be against a magician’s professional code, so if you reveal The Amazing Zorko’s disappearing belt buckle trick on Youtube, maybe Quandar the Mysterious will pointedly pretend you don’t exist the next time you try to say hi to him on the street. That doesn’t mean it’s illegal to reveal Zorko’s trick.