In Europe, Tintin is under copyright until 2053 (death + 70 years).
And the rightsholders (Tintinimaginatio, previously Moulinsart) are very aggressive about it, even more so than Disney. They don't have the lobbying power of Disney, but they are going to do everything in their power to protect and possibly overstep their rights. It includes using trademark laws and publishing new Tintin adventures against the will of the original author as an attempt to renew their copyright.
“It appears, from a 1942 document… that Hergé gave publishing rights for the books of the adventures of Tintin to publisher Casterman so Moulinsart is not the one to decide who can use material from the books,”
And the rightsholders (Tintinimaginatio, previously Moulinsart) are very aggressive about it, even more so than Disney. They don't have the lobbying power of Disney, but they are going to do everything in their power to protect and possibly overstep their rights. It includes using trademark laws and publishing new Tintin adventures against the will of the original author as an attempt to renew their copyright.