Those trains were blatantly copied by another Swedish company, and then that one was again blatantly copied by a Finnish company, leading to the models Dm6 and Dm7: https://en.wikipedia.org/wiki/VR_Class_Dm7
Well, SJ, the government operator started with the Y6 family of DMUs for standard, 1435mm, track gauge, these were built by AJS, Hägglunds, Kalmar verkstad and Märstaverken.
Then Hilding Carlsson built the Yp variant (for narrow gauge 891mm) of the Y6 family.
Those trains were blatantly copied by another Swedish company, and then that one was again blatantly copied by a Finnish company, leading to the models Dm6 and Dm7: https://en.wikipedia.org/wiki/VR_Class_Dm7
Zero royalties paid!
Well, SJ, the government operator started with the Y6 family of DMUs for standard, 1435mm, track gauge, these were built by AJS, Hägglunds, Kalmar verkstad and Märstaverken.
Then Hilding Carlsson built the Yp variant (for narrow gauge 891mm) of the Y6 family.