Using a cracked version of a plugin like Excalibur is a violation of copyright law. Software developers like Knights of the Editing Table invest countless hours into developing these tools, and using them without a license is essentially stealing their work. While individual users are rarely the target of massive lawsuits, it is not impossible. Moreover, if you are a freelance professional or work for a production house, using illegal software on company equipment opens the business up to significant legal liability and audits.