The phrase "willful violation" refers to purposely breaking a rule or law, knowing that it is wrong or forbidden. It implies that the person or entity knowingly and intentionally disregarded the required rules or laws. Full definition
Los Angeles Court Affirms Penalties for Willful Violation of Automatic Stay in Chapter 13 Bankruptcy Case (losangelesbankruptcylawyerblawg.com)
The commission found that Jenevein's actions in holding the news conference and sending the e-mails constituted willful violation of the state's Code of Judicial Conduct, as prohibited by Article 5, § 1 - a (6) A of the Texas Constitution. (news.lawreader.com)
The enforcement unit denies that it is reluctant to pursue criminal charges, but argues that it can be harder than agents think to prove willful violation of the law. (vox.com)