This is Extra Content (sometimes called Functional Content) that Adobe bundles with the CS5 applications.

Detail

ProductionPremium_MasterCollection_CS5_Content_ALL.dmg
Master Collection & Production Premium CS5 Mac Multi-Language Content Installer
Documentation and Fonts

InDesignFamily_7_Content_ALL.dmg
InDesign Family CS5 Mac Multi-Language Content Installer
Extra fonts

Illustrator_15_Content_LS1.dmg
Illustrator CS5 Mac English Content Installer
Extra fonts

Fireworks_11_Content_LS1.dmg
Fireworks CS5 Mac English Content Installer
Fonts, a few sample .png files and a simple tutorial.

AfterEffects_10_Content_LS7.dmg
After Effects CS5 Mac English/German/Spanish/French/Italian/Japanese/Korean Content Installer
Sample projects, templates (DVD menus, intros, covers, info page templates, etc.) and footage.

PremierePro_5_Content_LS7.dmg
Premiere Pro CS5 Mac German/Spanish/French/Italian/English/Japanese/Korean Content Installer
Functional content for Premiere Pro and Encore, like media assets, templates, menus, etc.

Requirements:

Corresponding Adobe CS5 application already installed

Homepage: http://www.adobe.com/products/creativesuite/