Keep in mind that copyright is for creative works. Facts can not be copyrighted. In a news article, it is the expression of the facts that covers the copyright, not the facts themselves. So you can definitely write an article stating the same facts as a Reuters press release (and be even based on that press release). You just can't base your prose on their prose. You have to completely rewrite it as a human -- it has to be an artefact, not an automated process.
However, there is another class of copyright for collections. A collection of facts can be copyrighted. You can't copy the same collection of the facts, nor a substantial portion of the collection. You can take individual facts out of the collection and include them in a creative work, but you can't just grab facts one at a time and create a new collection -- that would be a derived work.
Like all laws, copyright law is subject to interpretation by humans (lawyers and judges). While you might think that you are satisfying the law, they may disagree. To avoid that circumstance it is best to stay in an area where it is obvious to everyone that you are within the law. If you don't mind being sued, then you can try to push the boundaries. It is your choice.
Yes, it is a hard line to draw. It is advisable that if your business is dependent on being on the right side of copyright issues that you simply stay well away from the line.
Seems like a pretty hard line to draw.