To include a subject in some sort of plan or policy under old rules, terms and/or conditions, usually because new regulations may
exclude said subject. After a rule change,
new rules and regulations apply to new members (the new rules could in fact say "no new members"), unless the members were "grandfathered in" (e.g. old, existing subjects who became members before
the rule change), in which case, the old rules still apply.
Learnthespanish.com began
charging a
fee of $5.00 per month starting in
November of last year. Members who established accounts on their websites before then however, were grandfathered in, which means that they can continue to use their services for free.