The point is that Gibson registered the body shape as a trademark. It's now (legally) as much a part of the company's brand identity as the Gibson logo, and can therefore be defended just as vigourously.
You have to understand how intellectual property works:
Copyright applies to authorship of specific creative works (literary, dramatic, musical, artistic, etc.) and the original author has the right to protect that work from unauthorized duplication, performance, public display, etc. Copyright lasts for the life of the author plus 70 years.
When a company registers something as a trademark, they are essentially declaring that the specific registered work is fundamental to the company's ability to conduct business, and for identifying the company's unique products or services in the marketplace. Trademarks are generally company or product names, logos, or other unique identifiers.
Patents cover specific mechanical devices or methods for making something work.
In Fender's case, they've trademarked their unique headstock design, and are vigourously defending it so the import guitar companies can no longer produce guitars that are virtually unmistakable from the originals. This unauthorized copying of unique Fender traits hurt Fender's business, because it caused confusion in the marketplace.
Now Gibson has done the same with the Les Paul body shape. I can understand them going after Tokai, because the Love Rock guitars are virtually unmistakable from Les Pauls, even down to the script on the headstocks... they are very deliberately copycat guitars. The PRS case is a bit more of a stretch, but obviously Gibson's lawyers were more successful at convincing the judge about the Singlecut's similarities to the Les Paul than PRS's lawyers were at convincing him about the differences.
This ruling will just be the beginning, i'm sure. Warmoth will no doubt have to pay a licensing fee to Gibson to produce their "LP" bodies, just as they have to pay a fee to Fender to produce necks with accurate and authentic Strat, Tele, P-Bass and J-Bass headstocks.
The reason people can make JEM, RG and Universe bodies without repercussion is that Ibanez likely has not trademarked these body designs like they have their headstock design.