>>24489545
>>24489574
The other guy already said it, but you're retarded. A publisher wants first dibs because they make more money that way, not because previous publication means you've necessarily relinquished your copyright of a work. You retain copyright for all of your published works unless you or the law have specifically specified otherwise. In most countries the only way something automatically enters the public domain is if its publication age passes a certain threshold, like 100 years, or in some countries if something is a goverment work. It was only up to 1989 in the US that works released without a copyright notice entered the public domain automatically. In some countries it's actually really hard to dedicate something to the public domain explicitly (without meeting the normal criteria) and have that be legally binding, which is why things like the Creative Commons licences exist.

The closest condition to what you're describing is fair use policy, which isn't going to cover making a magazine out of random works without permission unless you're using very limited excerpts.