From Longman Dictionary of Contemporary English reserve the right to do something formal if you reserve the right to do something, you will do it if you think it is necessary – used especially in notices or official documents The management reserves the right to refuse admission. → reserve Examples from the Corpus reserve the right to do something • Human beings reserve the right to alter and change views.

When you reserve your rights, you are essentially letting the other party know that you are not waiving any of your rights by doing something or refraining from doing something. In other words, you’re letting others know that your conduct should not be deemed as a waiver, renunciation, or abandonment of your rights.