The IVS-BM has outlined their concerns about using Mendeley in their blog. They point out that “everybody should be aware of applicable copyright law in their country of research if they use cloud applications, such as Mendeley, for sharing and accessing full-texts on the web“.
The document “Mendeley – Information for users and librarians” can be downloaded at http://www.biochem.mpg.de/en/facilities/ivs/Dokumente/Mendeley.pdf http://www.biochem.mpg.de/886451/Mendeley.pdf (pdf).