100% can be register on blizzard's online store 

Blizzard store link  is http://www.blizzard.com/store/

In your Blizzard Account Management ==>Game Page,you can register it use the key.
Blizzard give you a 26 character game key to supports digital downloads. Head over to the Blizzard store and register the keys then download your CD image!

• Insert the game CD (We don't provide the CD ROM)
• Install the game - when prompted, type the key we provided via email
• The game will install
• You have full access to the game and all game servers you're the only owner of the key!

• Features:

  • Fantasy 3-D real-time strategy game from the masters at Blizzard Entertainment
  • Four unique races armed with distinctive units, magical abilities, and weapons of war
  • Build legendary heroes, whose ability to advance in levels and learn new spells and abilities makes them the core of each race's force
  • Neutral buildings and monsters offer challenge, treasure, and an uncertain factor
  • Full multiplayer support, including Internet play over Blizzard's improved Battle.net
    
  • Product Description
  • It has been nearly 15 years since the war between the orcs and humans ended. An uneasy peace settled over the land while, for years, the drums of war were silent. Yet the kingdoms of men grew complacent in their victory--and slowly, the defeated orcish clans regrouped under the banner of a new visionary leader.
    Now a darker shadow has fallen over the world, threatening to extinguish all life--all hope. The drums of war play upon the winds once again--rising urgently toward the inevitable hour when the skies will rain fire--and the world will tremble before the coming of the Burning Legion.
    WarCraft III returns players to the war-torn world of Azeroth. Developer Blizzard Entertainment combines the lessons learned from its bestselling StarCraft, the famous WarCraft lineage, and all-new 3-D technology to create an all-new, vibrant strategy game sure to become a classic.
    Wage war in a fully interactive 3-D world that incorporates nonplayer characters, wandering monsters, neutral towns, strongholds, temples, and environmental effects. Four mighty playable races--humans, orcs, night elves, and undead--compete in a finely balanced dance of conquest. Upgradable heroes gain experience and harness new powers as the game progresses. This is WarCraft that's intimately familiar, yet as you've never seen it before.
    Product Description
    Warcraft III: Reign Of Chaos is an impressive real time strategy game where you build, attack & destroy in a darker world. Visit the interactive 3D fantasy world of Azeroth, setting of the first two Warcraft games. It is 15 years after the war between humans and orcs. While mankind grew soft and complacent, the orcs were regrouping. The drums of war are beating again -- the Burning legion is coming and with it they bring terror and destruction. Do what you must to stop the death of your world.