sentences:  The aim of the agreement was to work out the principles of open participation of other institutions in the region.Principles of co-creation of the SDL are regulated by the Agreement on co-creation of the Silesian Digital Library, which has been established together by all institutions declaring the participation in the SDL, on October 24, 2006.The agreement is open in its character and all institutions sharing its aims and representing the area of culture, education and science can participate in it.