IANAL but the idea that you lose your trademark if you don't actively enforce it is not true except in rare edge cases. Whether or not this is an edge case is up to the courts.

What edge cases? Yes, you can most your trademark. It isnt so much as I'd you actively enforce it, but rather if you let the term fall into regular use.

Copyright does not work that way, unfortunately.

Trademark != Copyright (the concern here was with Trademark)

> trademark is supposed to work that way - you lose it if you don’t actively enforce it

That’s an oft repeated myth, but it’s not quite true.

From an article by the EFF:

> The circumstances under which a company could actually lose a trademark—such as abandonment and genericide—are quite limited. Genericide […] is very rare […]. Courts also set a very high bar to show abandonment (usually years of total non-use). Importantly, failure to enforce a mark against every potential infringer does not show abandonment.

[1] https://www.eff.org/deeplinks/2013/11/trademark-law-does-not...