You're free to use it with your Adobe Fonts account just as you would any other font in the Adobe Fonts library.
Source Han Serif Traditional Chinese is available via an open source license. Typefaces released as Adobe Originals are the result of years of work and study, regarded as industry standards for the ambition and quality of their development. Today the Type team’s mission is to make sophisticated and even experimental typefaces that explore the possibilities of design and technology. The Adobe Originals program started in 1989 as an in-house type foundry at Adobe, brought together to create original typefaces of exemplary design quality, technical fidelity, and aesthetic longevity.
