The phrase "fullest extent permitted by law" means doing something to the maximum extent that is allowed or allowed by the rules and regulations set by the law. Full definition
The second motion, filed on Mr. Trump's behalf, states that he joins Essential Consultants in seeking the change of venue and ends with the statement, «Mr. Trump intends to pursue his rights to the fullest extent permitted by the law.» (nytimes.com)
The directors are also entitled to (i) have the Company purchase directors» and officers» liability insurance on their behalf in reasonable amounts, (ii) the benefits of indemnification to the fullest extent permitted by law and by the Articles of Incorporation, Bylaws and any indemnification agreements, and (iii) exculpation as provided by state law and the Articles of Incorporation. (inc.skywest.com)
To the fullest extent permitted by law, these disclaimers and limitations of liability apply to any and all damages or injury whatsoever caused by or related to use of, or inability to use, the Help Scout Service under any cause or action whatsoever of any jurisdiction, including, without limitation, actions for breach of warranty, breach of contract or tort (including negligence). (helpscout.net)