SSP actually stands for the Space Studies Program at the International Space University in France, which isn't such a big secret since they have their own website: https://www.isunet.edu/ssp/
The Space Studies Program (SSP) offers an intensive nine-week course hosted each year in the timeframe June-August in different locations around the world. It provides courses in all space disciplines, as well as hands-on education through workshops and professional visits. This program offers a unique curriculum designed specifically for professionals starting or changing direction in their space careers.
The SSP is intended for people working in space-related fields who wish to broaden their knowledge base. During the SSP, participants work on team projects to address current and future challenges in the space sector. Since 1988, the SSP program exposes participants to broad new perspectives on the world’s space activities.