trademark Who says you cannot sell a trademarked domain?

[News]

At first sight, this thought-provoking statement would appear to be a cybersquatter’s mantra but instead it’s coming from an experienced attorney, Ari Goldberger.

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[Leo2k]

*Applicable only to confirm term domains I believe.
If the name is a creative word and if you approach the trademark owner it can easily become an udrp case, if the trademark owner wants to.
Otherwise, selling the domain through marketplace shouldn't be a problem I believe at long as it's not infringing the trademark by any means.