Licences are per use, not per asset
A track licensed for a personal video is not licensed for an ad, and a stock image licensed for a blog post may exclude print or merchandise. The same file carries different permissions depending on where it appears.
The guard asks for asset type and intended use together, because either alone produces the wrong answer.
Free-tier gotchas
Free plans commonly restrict commercial use, require attribution, cap downloads, or forbid use in certain contexts. These limits are written in the terms, not on the pricing page.
The safe default when the terms are ambiguous is to use a source with an explicit commercial licence, even if it costs money. One claim costs more than a year of the subscription.
授权是按用途，不是按素材
授权用于个人视频的曲目，不等于可用于广告；授权用于博客文章的图库图片，可能排除印刷或周边商品。同一个文件，出现在不同位置时权限不同。
检查器同时询问素材类型与使用场景，因为只问其中一个都会得到错误答案。
免费版的陷阱
免费套餐通常限制商用、要求署名、限制下载次数，或禁止在特定场景使用。这些限制写在条款里，而不是价格页上。
当条款含糊时，安全的默认做法是选有明确商用授权的来源，即使要花钱。一次版权主张的成本，高于一整年的订阅费。