What is Section 8 trademark declaration of use? When do I file Section 8 affidavit of use?

Congratulations, your trademark has been registered! Now, what? You only have to renew it every ten years, right? Actually, there’s a bit more work to be done. After a mark is successfully registered, you, the owner of the mark, must prove that your mark has been used in commerce for a continuous period of five [...]