Use for free,
but please set a link

ウェブサイト

Set a link on all pages where you use the icons. On every page, you could put a link in your footer.

デスクトップアプリ

Mac OS and Windows applications should have the link in your About dialog.

モバイルアプリ

For smartphone apps, please set a link in the About dialog or settings and on App Store or Google Play description.

オープンソース

Established open source projects could get the icons for free. For you, we'll opensource the resources that you need.
desktopwebsitesmobile
98% of cases are covered by the infographics above. When in doubt, check difficult circumstances or お問い合わせ.

Why to link?

The icons, sounds, and photos are free for personal use and also free for commercial use, but we require linking to our web site. We distribute them under the license called Creative Commons Attribution-NoDerivs 3.0 Unported.
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A true story
One girl didn't set a link and had no decent date for two years, and another guy set a link and got a top ranking in Google!