The SIL Open Font License should allow you to use the fonts for commercial YouTube videos without violating the license. Generally, the thing you...

This is clear copyright infringement, and you could bring legal action for statutory damages, likely in the tens of thousands of dollars. However,...

The most reliable way would be hiring someone to do a "patent search" on the product, where they would search the patent database to see if...

If your trademark is being registered for products, like "t-shirts" then you generally do need to actually have active sales of those products if...