How can a Master degree lead to 300 ECTS? http://emjd-dc.eu/files/2011/11/emjd-dc.pdf

Here, one of the admission requirements is, A Master's degree corresponding to 300 ECTS.

How is that possible?

A Masters degree is at most of 2 years. 2 years = 4 semesters.

1 semester = 5 courses = 5 * 6 = 30 ECTS.

Then, 4 semesters = 30 * 4 = 120 ECTS.

Where does 300 ECTS come from?
I'm guessing ECTS is the European Credit Transfer and Accumulation System. From that page, a bachelor's degree is worth 180-240 ECTS credits, and the master's is worth 60-120.

It sounds as though the institution you're interested in wants a master's degree and at least 300 ECTS credits. From the linked page, it's possible that you could have a master's but still only have 240 ECTS.