https://hn.algolia.com/?q=lego+calendar#!/story/forever/0/le...
the last line on the post says it is an experiment and not a product.
Do you have any examples of companies losing their trademark because of things similar to gurvinder's case?
https://en.wikipedia.org/wiki/Kleenex#Kleenex_Trademark
I do not know if that is due to their not defending the trademark or what the precise legal status is, though.
"33. Google abandoned any trademark rights in Chromium software by failing to control the nature and quality of the open source software developed by others but at the same time permitting others to distribute the third party software under the Chromium mark".
The case was settled.
The requirement to protect your trademark doesn't in any way impede your ability to license it to whomever you wish.
(IANAL, TINLA)
http://itlaw.wikia.com/wiki/Naked_license
Does that mean places that explicitly allow "fan fiction" derivative works that use the trademark, are placing themselves at risk of losing ownership of that trademark?
If so, that's very disappointing, as it would seem to be suppressing the ability of authors/creators to be generous with their creations.
[0] http://www.ikeahackers.net/2014/06/big-changes-coming-to-ike...
[1] http://www.ikeahackers.net/2014/06/inter-ikea-systems-bv-cal...