when you dump the rco you will get an xml that is outside the two dumped folders for this rco.
This xml controls everything to do with this RCO. Inside this will be the commands used in this part that your interested in 'About PlayStation3 System'. So when you select it on the xmb it tells the ps3 what to display, in what order, any icons needed an the text to go with it, where to get it all from, any timing and animation to go with it. Its a massive xml file and will take a while to find that part that pertains to this particular part your interested in.
'About PlayStation3 System is a combination of the this xml, the text xml in the text folder, and the images in the images folder, where all these Logos and trademark example are kept. And this also refers to any and all logos that are the property of SCEI, including any text that displays PlayStation on the system, abbreviated or not. There are also many other logos in various other RCO files like the PS3 logo, PlayStation3 logo (used in the old gameboot), S@ny Computer Entertainment Interactive (Only ever displayed once on brand new ps3s or when you have done a full system restore or when you boot the ps3 for the very first time). I have counted 6 RCOs so far with some kind of logo or trademark in them and some are repeated in different RCOs such as the PS Store logo and the PSN logo.
Also the there are only meant to be 2 actual logos displayed in top few lines of text 'About Playstation', the 'PS logo' and the 'DNS' logo. They are tiny but they are in the images folder of the RCO. The 'PlayStation' and 'PSP' are meant to be text. And the divx and other logos are also in the images folder of the RCO.
If you wanted to change the logo displayed in this then replace the png file in the images folder, label it exactly the same as the one you are replacing, re-compile the RCO, put it back in the dev_flash and the PS3 will display the logo you wanted instead, though it may look odd if its not the same size as well as the on you replaced.
If RCO mage is giving you issues dumping them then uncheck the VAG sound conversion box as it can cause issues when there are no sound files in the RCO your dumping, I had issue dumping them until I did this and also use RCO Mage MOD v1.1.2 from the devwiki, it works like a charm on windows 10.