DocuSign, Classmates.com facing lawsuits; e-readers outpace tablets

DocuSign, maker of electronic signature technology, has been sued by competitor RPost for patent infringement. The lawsuit, Rmail Limited et al v. Docusign Inc., was filed in the Texas Eastern District Court on Friday. RPost, which provides registered email services that allow senders to sign, record and collaborate, also filed suit against another competitor, RightSignature.