Potential as well as actual parties to lawsuits must implement a legal hold, to preserve records that may be relevant. (slaw.ca)
However, the Court is only allowed to consider arguments made in the courtroom and in documents properly filed by actual parties in the case as authorized by law and the Rules of Court. (floridasupremecourt.org)
This does not apply where the application is made without notice, or all parties are unrepresented or there are more than four participants, irrespective of the number of actual parties. (newlawjournal.co.uk)