So have countless reporters here in the US, none of whom have been prosecuted for the same.
The selective prosecution argument alone acquits.
The indictment alleges that in March 2010, Assange engaged in a conspiracy with Chelsea Manning, a former intelligence analyst in the U.S. Army, to assist Manning in cracking a password stored on U.S. Department of Defense computers connected to the Secret Internet Protocol Network (SIPRNet), a U.S. government network used for classified documents and communications. Manning, who had access to the computers in connection with her duties as an intelligence analyst, was using the computers to download classified records to transmit to WikiLeaks. Cracking the password would have allowed Manning to log on to the computers under a username that did not belong to her. Such a deceptive measure would have made it more difficult for investigators to determine the source of the illegal disclosures.
During the conspiracy, Manning and Assange engaged in real-time discussions regarding Mannings transmission of classified records to Assange. The discussions also reflect Assange actively encouraging Manning to provide more information. During an exchange, Manning told Assange that after this upload, thats all I really have got left. To which Assange replied, curious eyes never run dry in my experience.
Assange is charged with conspiracy to commit computer intrusion and is presumed innocent unless and until proven guilty beyond a reasonable doubt. If convicted, he faces a maximum penalty of five years in prison. Actual sentences for federal crimes are typically less than the maximum penalties. A federal district court judge will determine any sentence after taking into account the U.S. Sentencing Guidelines and other statutory factors.