LOCKSS, as a electronic journal digital preservation system, covers subscribed and freely available journals. I have been looking at the balance of activated titles at De Montfort University and found about 43% to be subscribed titles and 27% to be journals listed in the Directory of Open Access Journals.
A further category of journals would be those available without charge, but not included in the DOAJ. These would be included in the SFX Free ejournals target. However there might be an overlap between this target and the DOAJ.
|Num. of Titles||Unique||Title Overlap||% Unique Titles||% Title Overlap|
|Free E- Journals||20479||20360||119||99.4||0.6|
The overlap between LOCKSS and DOAJ/Free Ejournals combined in 276 titles or 40.8%.