Valve Permission Statement (DotA 2

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Permission to use VALVE's Dota 2 models

As it is written in VALVE's Steam Subscriber Agreement:

G. Restrictions on Use of Software

You may not use the Software for any purpose other than the permitted access to Steam and your Subscriptions, and to make personal, non-commercial use of your Subscriptions, except as otherwise permitted by this Agreement or applicable Subscription Terms. Except as otherwise permitted under this Agreement (including any Subscription Terms or Rules of Use), or under applicable law notwithstanding these restrictions, you may not, in whole or in part, copy, photocopy, reproduce, publish, distribute, translate, reverse engineer, derive source code from, modify, disassemble, decompile, create derivative works based on, or remove any proprietary notices or labels from the Software or any software accessed via Steam without the prior consent, in writing, of Valve.

And:

C. License to Use Valve Developer Tools

Your Subscription(s) may include access to various Valve tools that can be used to create content ("Developer Tools"). Some examples include: the Valve software development kit (the "SDK") for a version of the computer game engine known as "Source" (the "Source Engine") and the associated Valve Hammer editor, The Source® Filmmaker Software, or in-game tools through which you can edit or create derivative works of a Valve game. Particular Developer Tools (for example, The Source® Filmmaker Software) may be distributed with separate Subscription Terms that are different from the rules set forth in this Section. Otherwise, you may use the Developer Tools, and you may use, reproduce, publish, perform, display and distribute any content you create using the Developer Tools, however you wish, but solely on a non-commercial basis.

Credit to Valve
Credit to AProject for posting the quotes on Iceborn