It's also possible that he's innocent.
Read the statement of facts in the PDF as well: (http://sec.gov/litigation/complaints/2008/comp20810.pdf). After reading it, chances seem slim that he's innocent.
"On June 29,2004, Cuban sold his remaining 590,000 Mamma.com shares during regular trading at an average cost per share of $13.2937.
On June 29,2004, at 6:00 p.m. after the markets had closed, Mamma.com publicly announced the PIPE offering."
http://sports.espn.go.com/nba/columns/story?columnist=munson...
Yes, until proven guilty.