if you want to trust wikipedia

Second-party developer

Second party developer is a colloquial term used by gaming enthusiasts to describe independently owned studios who take development contracts from the platform holders. In reality the resulting game is first party (since it is funded by the platform holder who usually owns the resulting IP), but the term helps to distinguish independent studios from those directly owned by the platform holder. These studios may have exclusive publishing agreements (or other business relationships) with the platform holder, while maintaining independence. Examples are Insomniac Games(which previously developed games solely for Sony's PlayStation platforms as an independent studio) and Game Freak, (which primarily develops the Nintendo-exclusive Pokémon game series).

- Demon's Souls is first-party... Sony owns the IP
- Journey is first first-pary... Sony owns the IP
- Iron Brigade is third-party.

http://en.wikipedia.org/wiki/Sony_Computer_Entertainment#Owned_franchises_and_properties

1 Little Big PLanet 95 1st party
2 Uncharted 88 1st party
3 Resistance 86 1st party
4 Super Stardust HD 85 1st party
5 Infamous 85 1st party
6 Warhawk 84 1st party
7 Dyad 82
8 Modnation Racers 82 1st party
9 Singstar 82 1st party
10 Echochrome 81 1st party


2 Journey 92 2nd party
3 Ico Collection 92 Not even an original IP
4 Demon's Souls 89 3rd party
6 Heavy Rain 87 2nd party
7 Pixeljunk shooter 87 3rd party
8 Flower 87 2nd party
19 PixelJunk Eden 80 3rd party
13 Everyday Shooter 83 3rd party
11 Hustle Kings 81 3rd party

But a First-Party IP from a Second Party Dev (What a mess!) is exclusive to the company where the IP is, or it can go multiplatform?

- Demon's Souls is... Sony can do Demon's Souls 2 even without the From Software.
- Torchlight I don't know.

Sony owned IPs: http://en.wikipedia.org/wiki/Sony_Computer_Entertainment#Owned_franchises_and_properties

Im not even going to do the MSFT list. Most of those are 3rd party as well. You need to look up what developers make the game. Unless it is a Sony/MSFT owned developer then it is not 1st party.

That reminds me Kagura is yet to be released in the west. :(

look at my other comments.  

Demon's ouls might be owned by sony, not sure.

Torchlight is not owned by MSFT.  most of these games are not 1st party on both lists. these are 3rd party/2nd party developers developing exclusively for the consoles.

You are making confusion... the devolper is second or third-party but the IP is Sony first-party.

Journey, ICO, Demon's Souls, Heavy Rain, PixelJunk, Flower, Everyday Shooter and Hustle Kings are all Sony first-party IPs.

I did not know that there was an Onechanbara fan in this site ^^